java 自动关闭资源的try语句

Java 7简化资源清理(try-with-resources)自动关闭资源的try语句

自动关闭资源格式：

try( )//此处多了圆括号，（）圆括号内写打开资源的代码，在这里创建的对象必须实现Autocloseable接口

{

IO操作

}

catch（）{

处理异常的代码

}

Eg：package july7file;

//java7开始的自动关闭资源

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

public class Demo8 {

public static void main(String[] args) throws IOException {

File src = new File("E:/自荐信.doc");

File tar = new File("E:/自荐信1.doc");

copy(src, tar);

System.out.println("Well done ！");

}

public static void copy(File src, File tar) throws IOException {

try (InputStream is = new FileInputStream(src);

OutputStream os = new FileOutputStream(tar);) //圆括号内写打开资源的操作

{

byte[] b = new byte[1024];

int len;

while ((len = is.read(b)) != -1) {

os.write(b);

}

} catch (IOException e) {

e.printStackTrace();

}

}

}