Runtime.addShutdownHook添加钩子

1 方法含义 void java.lang.Runtime.addShutdownHook(Thread hook) 用来在jvm中增加一个关闭的钩子。 当程序正常退出,系统调用System.exit方法或虚拟机被关闭时才会执行添加的shutdownHook线程。其中shutdownHook是一个已初始化但并不有启动的线程，当jvm关闭时会执行系统中已经设置的所有通过方法addShutdownHook添加的钩子，当系统执行完这些钩子后，jvm才会关闭。所以可通过这些钩子在jvm关闭的时候进行内存清理、资源回收等工作。2 示例代码 public class TestRuntimeShutdownHook {public static void main(String[] args) {Thread shutdownHookOne = new Thread() {public void run() {System.out.println("shutdownHook one...");}};Runtime.getRuntime().addShutdownHook(shutdownHookOne);Runnable threadOne = new Runnable() {public void run() {try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("thread one doing something...");}};Runnable threadTwo = new Thread() {public void run() {try {Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("thread two doing something...");}};threadOne.run();threadTwo.run();} } 输出如下： thread one doing something... thread two doing something... shutdownHook one... 原贴地址：http://kim-miao.iteye.com/blog/1662550