java 7的try-with-resources释放资源，,在java7中try后面

java 7的try-with-resources释放资源，,在java7中try后面

在java7中try后面可以跟上资源对象的声明，可以实现在finally中释放资源的功能，如下代码示例：

//try-with-resource statementtry (PrintWriter out2 = new PrintWriter(            new BufferedWriter(            new FileWriter("out.txt", true)))) {    out2.println("the text");} catch (IOException e) {    e.printStackTrace();}

上面的代码实际等同于如下代码：

//close() is in finally clausePrintWriter out = null;try {    out = new PrintWriter(        new BufferedWriter(        new FileWriter("out.txt", true)));    out.println("the text");} catch (IOException e) {    e.printStackTrace();} finally {    if (out != null) {        out.close();    }}

上一个的语法更简洁了一些。