JAVA——反射机制，

JAVA——反射机制，

1. Class类 普通对象构造方式：

// 创建Book实例对象
Book book = new Book(); 

对于Class的实例对象如何构造呢？ Class的构造函数是私有的，只有JVM才能创建实例对象

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">// Class的构造函数是私有的，只有JVM才能创建Class实例对象</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class1 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">new</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">Class</span><span class="pun" style="color:#93a1a1;">();</span><span class="pln" style="color:#48484c;">  </span><span class="com" style="color:#93a1a1;">// 错误</span></code></div></div>

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="kwd" style="color:#1e347b;">public</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">final</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">class</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">Class</span><span class="pun" style="color:#93a1a1;"><</span><span class="pln" style="color:#48484c;">T</span><span class="pun" style="color:#93a1a1;">></span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">implements</span><span class="pln" style="color:#48484c;"> java</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">io</span><span class="pun" style="color:#93a1a1;">.</span><span class="typ" style="color:teal;">Serializable</span><span class="pun" style="color:#93a1a1;">,</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">                              java</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">lang</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">reflect</span><span class="pun" style="color:#93a1a1;">.</span><span class="typ" style="color:teal;">GenericDeclaration</span><span class="pun" style="color:#93a1a1;">,</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">                              java</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">lang</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">reflect</span><span class="pun" style="color:#93a1a1;">.</span><span class="typ" style="color:teal;">Type</span><span class="pun" style="color:#93a1a1;">,</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">                              java</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">lang</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">reflect</span><span class="pun" style="color:#93a1a1;">.</span><span class="typ" style="color:teal;">AnnotatedElement</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">    </span><span class="com" style="color:#93a1a1;">/*</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">     * Constructor. Only the Java Virtual Machine creates Class</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">     * objects.</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">     */</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">    </span><span class="kwd" style="color:#1e347b;">private</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">Class</span><span class="pun" style="color:#93a1a1;">()</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{}</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">    </span><span class="pun" style="color:#93a1a1;">....</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;"> </span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pun" style="color:#93a1a1;">}</span></code></div></div>

Class有三种表示方式：
（1）XXX.class  XXX为类名   实际再告诉我们任何一个类都有一个隐含的已经太成员变量class

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class1 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;">  </span><span class="typ" style="color:teal;">Book</span><span class="pun" style="color:#93a1a1;">.</span><span class="kwd" style="color:#1e347b;">class</span><span class="pun" style="color:#93a1a1;">;</span></code></div></div>

（2）XXX.getClass()  XXX为对象名称 已知该类的实例对象，通过getClass()方法获取

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="typ" style="color:teal;">Book</span><span class="pln" style="color:#48484c;"> book </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">new</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">Book</span><span class="pun" style="color:#93a1a1;">();</span><span class="pln" style="color:#48484c;"> </span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class2 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> book</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getClass</span><span class="pun" style="color:#93a1a1;">();</span></code></div></div>

（3）通过Class类的forName方法获取  

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="kwd" style="color:#1e347b;">try</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class3 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">Class</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">forName</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"com.qunar.bean.Book"</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">class1 </span><span class="pun" style="color:#93a1a1;">==</span><span class="pln" style="color:#48484c;"> class2</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">class1 </span><span class="pun" style="color:#93a1a1;">==</span><span class="pln" style="color:#48484c;"> class3</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">ClassNotFoundException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span></code></div><li style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:12px!important">
</li></div>

我们完全可以通过类的类类型创建该类的对象实例，通过class1，class2以及class3创建Book的实例

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="kwd" style="color:#1e347b;">try</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class3 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">Class</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">forName</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"com.qunar.bean.Book"</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 通过类类型的newInstance方法创建实例对象</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Book</span><span class="pln" style="color:#48484c;"> book2 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">Book</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;">class3</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">newInstance</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			book2</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">setPrice</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"23.4"</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">ClassNotFoundException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">InstantiationException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">IllegalAccessException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span></code></div></div>

2. Class动态加载类
Class.forName("类的全称")  不仅表示了类的类类型，还代表了动态加载类。 编译时刻加载类是静态加载类，运行时刻加载类是动态加载类。
3.反射
反射机制--用来检查可用的方法，并返回方法名。
人们想要在运行时获取类的信息的另一个动机，便是希望提供在跨网络的远程平台上创建和运行对象的能力。这被称为远程方法调用，它允许一个Java程序将对象分布到多台机器上。
class类与java.lang.reflect类库一起对反射的概念进行了支持，该类库包含了Filed,Method以及Constructor类（每个类都实现了Member接口）。这些类型的对象是由JVM在运行时创建的，用以表示未知类里对应的成员。这样你就可以使用Constructor创建新的对象，用get()和set()方法读取和修改与Field对象关联的字段，用invoke()方法调用与method对象关联的方法。另外，还可以调用getFields(),getMethods()和getConstructors()等很便利的方法，以返回表示字段，方法以及构造器的对象的数组。这样，匿名对象的类信息就能在运行时被完全确定下来，而在编译时不需要知道任何事情。
其实，反射机制并没有什么神奇之处。当通过反射与一个未知类型的对象打交道时，JVM只知道简单的检查这个对象，看它属于哪个特定的类。在用它做其他事情之前，我们必须先加载这个类的class对象。因此，那个类的.class文件对于JVM来说必须是可获取的，要么在本地机器上，要么可以通过网络可以获得。对于反射机制而言，在编译时不能取得.class文件，只能在运行时打开和检查.class文件。
3.1 获取方法信息

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="kwd" style="color:#1e347b;">package</span><span class="pln" style="color:#48484c;"> com</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">qunar</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">reflect</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="kwd" style="color:#1e347b;">public</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">class</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">ReflectDemo</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="kwd" style="color:#1e347b;">public</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">static</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">void</span><span class="pln" style="color:#48484c;"> main</span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">String</span><span class="pun" style="color:#93a1a1;">[]</span><span class="pln" style="color:#48484c;"> args</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// int的类类型</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class1 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">int</span><span class="pun" style="color:#93a1a1;">.</span><span class="kwd" style="color:#1e347b;">class</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class2 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">String</span><span class="pun" style="color:#93a1a1;">.</span><span class="kwd" style="color:#1e347b;">class</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class3 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">double</span><span class="pun" style="color:#93a1a1;">.</span><span class="kwd" style="color:#1e347b;">class</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class4 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">Double</span><span class="pun" style="color:#93a1a1;">.</span><span class="kwd" style="color:#1e347b;">class</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> class5 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">void</span><span class="pun" style="color:#93a1a1;">.</span><span class="kwd" style="color:#1e347b;">class</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"class1->"</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> class1</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"class2->"</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> class2</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"class3->"</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> class3</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"class4->"</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> class4</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"class5->"</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> class5</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="pun" style="color:#93a1a1;">}</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pun" style="color:#93a1a1;">}</span></code></div></div>

运行结果：

class1->int class2->java.lang.String class3->double class4->java.lang.Double class5->void

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">// 只打印简单名称（不包含包名称）</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"class2->"</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> class2</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getSimpleName</span><span class="pun" style="color:#93a1a1;">());</span><span class="pln" style="color:#48484c;"> </span><span class="com" style="color:#93a1a1;">// String</span></code></div></div>

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="com" style="color:#93a1a1;">/**</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 * 打印类成员方法信息（public函数，包括父类继承而来的）</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 * @param object</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 */</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="kwd" style="color:#1e347b;">public</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">static</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">void</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">PrintClassPublicFunction</span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">Object</span><span class="pln" style="color:#48484c;"> object</span><span class="pun" style="color:#93a1a1;">){</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// 获取类的信息，首先获取类的类类型</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// 传递的是哪个子类的对象 c 就是该子类的类类型</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> c </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> object</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getClass</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"类的全称是："</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> c</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// 一个成员方法就是一个method对象</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// getMethods方法是获取的是所有public的函数，包括父类继承而来的</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Method</span><span class="pun" style="color:#93a1a1;">[]</span><span class="pln" style="color:#48484c;"> methods </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> c</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getMethods</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="kwd" style="color:#1e347b;">for</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">Method</span><span class="pln" style="color:#48484c;"> method </span><span class="pun" style="color:#93a1a1;">:</span><span class="pln" style="color:#48484c;"> methods</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 获取方法返回值类型的类类型</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> returnType </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> method</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getReturnType</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">print</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">returnType</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">()</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> </span><span class="str" style="color:#dd1144;">" "</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 获取方法的名称</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">print</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">method</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">()</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> </span><span class="str" style="color:#dd1144;">"("</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 获取方法参数</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 得到方法参数列表中类型的类类型</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Class</span><span class="pun" style="color:#93a1a1;">[]</span><span class="pln" style="color:#48484c;"> paramTypes </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> method</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getParameterTypes</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="kwd" style="color:#1e347b;">int</span><span class="pln" style="color:#48484c;"> size </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> paramTypes</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">length</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="kwd" style="color:#1e347b;">for</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="kwd" style="color:#1e347b;">int</span><span class="pln" style="color:#48484c;"> i </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="lit" style="color:#195f91;">0</span><span class="pun" style="color:#93a1a1;">;</span><span class="pln" style="color:#48484c;">i </span><span class="pun" style="color:#93a1a1;"><</span><span class="pln" style="color:#48484c;"> size</span><span class="pun" style="color:#93a1a1;">;++</span><span class="pln" style="color:#48484c;">i</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">				</span><span class="kwd" style="color:#1e347b;">if</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">i </span><span class="pun" style="color:#93a1a1;">!=</span><span class="pln" style="color:#48484c;"> </span><span class="lit" style="color:#195f91;">0</span><span class="pun" style="color:#93a1a1;">){</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">					</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">print</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">","</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">				</span><span class="pun" style="color:#93a1a1;">}</span><span class="com" style="color:#93a1a1;">//if</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">				</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">print</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">paramTypes</span><span class="pun" style="color:#93a1a1;">[</span><span class="pln" style="color:#48484c;">i</span><span class="pun" style="color:#93a1a1;">].</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="pun" style="color:#93a1a1;">}</span><span class="com" style="color:#93a1a1;">//for</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">")"</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="com" style="color:#93a1a1;">//for</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="pun" style="color:#93a1a1;">}</span></code></div></div>

运行结果：

boolean startsWith(java.lang.String) boolean startsWith(java.lang.String,int) java.lang.CharSequence subSequence(int,int) java.lang.String substring(int,int) java.lang.String substring(int) [C toCharArray() java.lang.String toLowerCase(java.util.Locale) java.lang.String toLowerCase() java.lang.String toUpperCase() java.lang.String valueOf([C) java.lang.Class getClass() void notify() void notifyAll() void wait(long) void wait(long,int) void wait() ....

3.2 获取成员变量信息

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="com" style="color:#93a1a1;">/**</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 * 打印类成员变量信息</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 * @param object</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 */</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="kwd" style="color:#1e347b;">public</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">static</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">void</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">PrintClassFiled</span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">Object</span><span class="pln" style="color:#48484c;"> object</span><span class="pun" style="color:#93a1a1;">){</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// 获取类的信息，首先获取类的类类型</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// 传递的是哪个子类的对象 c 就是该子类的类类型</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> c </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> object</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getClass</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">/* 成员变量也是对象，java.lang.reflect.Field 类封装了关于成员变量的操作</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">		 * getFields()方法获取的是所有的public的成员变量的信息</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">		 * getDeclaredFields()获取的是该类自己声明的成员变量的信息</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">		 */</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Field</span><span class="pun" style="color:#93a1a1;">[]</span><span class="pln" style="color:#48484c;"> fields </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> c</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getDeclaredFields</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="kwd" style="color:#1e347b;">for</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">Field</span><span class="pln" style="color:#48484c;"> field </span><span class="pun" style="color:#93a1a1;">:</span><span class="pln" style="color:#48484c;"> fields</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 得到成员变量的类型的类类型</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> fieldType </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> field</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getType</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 得到成员变量的类型</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">print</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">fieldType</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">()</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> </span><span class="str" style="color:#dd1144;">" "</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 得到成员变量的名称</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">field</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="com" style="color:#93a1a1;">//for</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="pun" style="color:#93a1a1;">}</span></code></div></div>

运行结果：

int MIN_VALUE int MAX_VALUE java.lang.Class TYPE [C digits [C DigitTens [C DigitOnes [I sizeTable int value int SIZE long serialVersionUID boolean $assertionsDisabled

3.3 获取构造函数信息

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="com" style="color:#93a1a1;">/**</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 * 打印类构造函数信息</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 * @param object</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">	 */</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="kwd" style="color:#1e347b;">public</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">static</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">void</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">PrintClassConstructor</span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">Object</span><span class="pln" style="color:#48484c;"> object</span><span class="pun" style="color:#93a1a1;">){</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// 获取类的信息，首先获取类的类类型</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// 传递的是哪个子类的对象 c 就是该子类的类类型</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> c </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> object</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getClass</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">				</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">/* 构造函数也是对象，java.lang.reflect.Constructor 类封装了关于构造函数的操作</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">		 * getConstructors()方法获取的是所有的public的构造函数的信息</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">		 * getDeclaredConstructors()获取的是该类自己声明的构造函数的信息</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">		 */</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Constructor</span><span class="pun" style="color:#93a1a1;">[]</span><span class="pln" style="color:#48484c;"> constructors </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> c</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getConstructors</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="kwd" style="color:#1e347b;">for</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">Constructor</span><span class="pln" style="color:#48484c;"> constructor </span><span class="pun" style="color:#93a1a1;">:</span><span class="pln" style="color:#48484c;"> constructors</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 构造函数的名称</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">print</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">constructor</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">()</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">+</span><span class="pln" style="color:#48484c;"> </span><span class="str" style="color:#dd1144;">"("</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 获取构造函数的参数列表，得到的是参数列表的类类型</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Class</span><span class="pun" style="color:#93a1a1;">[]</span><span class="pln" style="color:#48484c;"> paramTypes </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> constructor</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getParameterTypes</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="kwd" style="color:#1e347b;">int</span><span class="pln" style="color:#48484c;"> size </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> paramTypes</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">length</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="kwd" style="color:#1e347b;">for</span><span class="pun" style="color:#93a1a1;">(</span><span class="kwd" style="color:#1e347b;">int</span><span class="pln" style="color:#48484c;"> i </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="lit" style="color:#195f91;">0</span><span class="pun" style="color:#93a1a1;">;</span><span class="pln" style="color:#48484c;">i </span><span class="pun" style="color:#93a1a1;"><</span><span class="pln" style="color:#48484c;"> size</span><span class="pun" style="color:#93a1a1;">;++</span><span class="pln" style="color:#48484c;">i</span><span class="pun" style="color:#93a1a1;">){</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">				</span><span class="kwd" style="color:#1e347b;">if</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">i </span><span class="pun" style="color:#93a1a1;">!=</span><span class="pln" style="color:#48484c;"> </span><span class="lit" style="color:#195f91;">0</span><span class="pun" style="color:#93a1a1;">){</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">					</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">print</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">","</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">				</span><span class="pun" style="color:#93a1a1;">}</span><span class="com" style="color:#93a1a1;">//if</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">				</span><span class="com" style="color:#93a1a1;">// 得到参数名称</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">				</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">print</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">paramTypes</span><span class="pun" style="color:#93a1a1;">[</span><span class="pln" style="color:#48484c;">i</span><span class="pun" style="color:#93a1a1;">].</span><span class="pln" style="color:#48484c;">getName</span><span class="pun" style="color:#93a1a1;">());</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="pun" style="color:#93a1a1;">}</span><span class="com" style="color:#93a1a1;">//for</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">")"</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="com" style="color:#93a1a1;">//for</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="pun" style="color:#93a1a1;">}</span></code></div></div>

运行结果：

java.lang.String([B) java.lang.String([B,int,int) java.lang.String([B,java.nio.charset.Charset) java.lang.String([B,java.lang.String) java.lang.String([B,int,int,java.nio.charset.Charset) java.lang.String(java.lang.StringBuilder) java.lang.String(java.lang.StringBuffer) java.lang.String([I,int,int) java.lang.String([C,int,int) java.lang.String([C) java.lang.String(java.lang.String) java.lang.String() java.lang.String([B,int,int,java.lang.String) java.lang.String([B,int) java.lang.String([B,int,int,int)

3.4 方法的反射
如何获取某个方法？方法的名称和方法的参数列表才能唯一决定某个方法。 如何进行操作？通过method.invoke(对象,参数列表)

<div class="linenums" style="margin:0px; padding-left:0px; color:rgb(30,52,123)"><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="kwd" style="color:#1e347b;">package</span><span class="pln" style="color:#48484c;"> com</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">qunar</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">reflect</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="kwd" style="color:#1e347b;">import</span><span class="pln" style="color:#48484c;"> java</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">lang</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">reflect</span><span class="pun" style="color:#93a1a1;">.</span><span class="typ" style="color:teal;">InvocationTargetException</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="kwd" style="color:#1e347b;">import</span><span class="pln" style="color:#48484c;"> java</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">lang</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">reflect</span><span class="pun" style="color:#93a1a1;">.</span><span class="typ" style="color:teal;">Method</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="kwd" style="color:#1e347b;">import</span><span class="pln" style="color:#48484c;"> com</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">qunar</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">bean</span><span class="pun" style="color:#93a1a1;">.</span><span class="typ" style="color:teal;">Calculates</span><span class="pun" style="color:#93a1a1;">;</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="kwd" style="color:#1e347b;">public</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">class</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">ReflectDemo</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"> </code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="kwd" style="color:#1e347b;">public</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">static</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">void</span><span class="pln" style="color:#48484c;"> main</span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">String</span><span class="pun" style="color:#93a1a1;">[]</span><span class="pln" style="color:#48484c;"> args</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">// 获取类的信息，首先获取类的类类型</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Calculates</span><span class="pln" style="color:#48484c;"> calculates </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">new</span><span class="pln" style="color:#48484c;"> </span><span class="typ" style="color:teal;">Calculates</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		calculates</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">setNum1</span><span class="pun" style="color:#93a1a1;">(</span><span class="lit" style="color:#195f91;">20</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		calculates</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">setNum2</span><span class="pun" style="color:#93a1a1;">(</span><span class="lit" style="color:#195f91;">40</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="typ" style="color:teal;">Class</span><span class="pln" style="color:#48484c;"> c </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> calculates</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getClass</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">						</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="com" style="color:#93a1a1;">/* getMethod()方法获取的是public的方法信息</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">		 * getDeclaredMethod()获取的是该类自己声明的方法的信息</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="com" style="color:#93a1a1;">		 */</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="kwd" style="color:#1e347b;">try</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 获取方法  名称和参数列表共同决定</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// Method method = c.getDeclaredMethod("add", new Class[]{int.class,int.class});</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Method</span><span class="pln" style="color:#48484c;"> method </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> c</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getDeclaredMethod</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"add"</span><span class="pun" style="color:#93a1a1;">,</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">int</span><span class="pun" style="color:#93a1a1;">.</span><span class="kwd" style="color:#1e347b;">class</span><span class="pun" style="color:#93a1a1;">,</span><span class="kwd" style="color:#1e347b;">int</span><span class="pun" style="color:#93a1a1;">.</span><span class="kwd" style="color:#1e347b;">class</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 方法的反射 </span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 对于calculates.add(10,40)来说，方法的反射操作是用method方法调用 和 calculates.add(10,40)的效果一样</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// int result = (int)method.invoke(calculates, new Object[]{10,40});</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="kwd" style="color:#1e347b;">int</span><span class="pln" style="color:#48484c;"> result </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="kwd" style="color:#1e347b;">int</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;">method</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">invoke</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">calculates</span><span class="pun" style="color:#93a1a1;">,</span><span class="pln" style="color:#48484c;"> </span><span class="lit" style="color:#195f91;">10</span><span class="pun" style="color:#93a1a1;">,</span><span class="lit" style="color:#195f91;">40</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">System</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">out</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">println</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">result</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="com" style="color:#93a1a1;">// 对于没有参数的方法</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			</span><span class="typ" style="color:teal;">Method</span><span class="pln" style="color:#48484c;"> method2 </span><span class="pun" style="color:#93a1a1;">=</span><span class="pln" style="color:#48484c;"> c</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">getDeclaredMethod</span><span class="pun" style="color:#93a1a1;">(</span><span class="str" style="color:#dd1144;">"print"</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			method2</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">invoke</span><span class="pun" style="color:#93a1a1;">(</span><span class="pln" style="color:#48484c;">calculates</span><span class="pun" style="color:#93a1a1;">);</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">NoSuchMethodException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">SecurityException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L7" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L8" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">IllegalAccessException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L9" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L0" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">IllegalArgumentException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L1" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L2" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span><span class="pln" style="color:#48484c;"> </span><span class="kwd" style="color:#1e347b;">catch</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">(</span><span class="typ" style="color:teal;">InvocationTargetException</span><span class="pln" style="color:#48484c;"> e</span><span class="pun" style="color:#93a1a1;">)</span><span class="pln" style="color:#48484c;"> </span><span class="pun" style="color:#93a1a1;">{</span></code></div><div class="L3" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">			e</span><span class="pun" style="color:#93a1a1;">.</span><span class="pln" style="color:#48484c;">printStackTrace</span><span class="pun" style="color:#93a1a1;">();</span></code></div><div class="L4" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">		</span><span class="pun" style="color:#93a1a1;">}</span></code></div><div class="L5" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pln" style="color:#48484c;">	</span><span class="pun" style="color:#93a1a1;">}</span></code></div><div class="L6" style="margin:0px; color:rgb(190,190,197); line-height:18px; padding-left:0px; list-style-type:none"><code class="language-java" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word; margin:8px 0px"><span class="pun" style="color:#93a1a1;">}</span></code></div></div>