原型模式，
浅拷贝：实例的基本数据类型（8种），重新clone一个数据一样的实例对象，引用类型clone地址值，不重新生成引用对象副本引用类型不独立
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public class Person
implements Cloneable {
private String name;
private int age;
private String sex;
private List<String>
friends;
public List<String>
getFriends() {
return friends;
}
public void setFriends(List<String>
friends) {
this.friends =
friends;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name =
name;
}
public int getAge() {
return age;
}
public void setAge(
int age) {
this.age =
age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex =
sex;
}
@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
", age=" + age +
", sex='" + sex + '\'' +
", friends=" + friends +
'}'
;
}
/* @Override//单纯的引用地址值
protected Person clone(){
try {
return (Person) super.clone();
} catch (CloneNotSupportedException e) {
e.printStackTrace();
return null;
}
}*/
@Override
protected Person clone() {
try {
Person person = (Person)
super.clone();
List<String> friends =
new ArrayList<>
();
for (String friend :
this.friends) {
friends.add(friend);
}
person.setFriends(friends);
return person;
} catch (CloneNotSupportedException e) {
e.printStackTrace();
}
return null;
}
}
View Code
深拷贝：实例的任何类型都clone一份，副本完全独立
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public class MainClass {
public static void main(String[] args) {
Person person =
new Person();
person.setAge(1
);
person.setName("张三"
);
person.setSex("男"
);
/* Person person2=new Person();
person2.setAge(1);
person2.setName("李四");
person2.setSex("男");*/
/*Person person2 = person.clone();
person2.setName("李四");
System.out.println(person);
System.out.println(person2);*/
ArrayList<String> friends =
new ArrayList<>
();
friends.add("kobe"
);
friends.add("t-mac"
);
person.setFriends(friends);
Person person1 =
person.clone();
friends.add("Iverson"
);
System.out.println(person);
System.out.println(person1);
}
}
View Code
浅拷贝单纯继承了Object的clone()方法，而深拷贝继承的同时也将引用类型的实例对象依次克隆。
小结：原型模式主要将需要创建的实例对象实现Cloneable接口，重写clone()方法，倘若需要主副分离就深拷贝，那样就互不影响，倘若为了节省在资源或者仅仅改变基本数据类型，那么浅拷贝也是不错的。
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