Runtime.getRuntime().addShutdownHook()的使用

Runtime.getRuntime().addShutdownHook(Thread);
//addShutdownHook是指，增加JVM停止时要做处理事件。当JVM停止时，就会把之前增加的这些HOOK逐个运行。
运行这个例子可以简单体会到它的作用．
package Thread;
public class Thread1 extends Thread{
public void run() {
int i=0;
while(i<10){
try {
Thread.sleep(2000);
}
catch (InterruptedException ex) {
}
System.out.println("~Thread 1~");
i++;
}
}
}
package Thread;
public class Thread2 extends Thread{
public void run() {
int i=0;
while(i<10){
try {
Thread.sleep(1000);
}
catch (InterruptedException ex) {
}
System.out.println("~Thread 2~");
i++;
}
}
}
package Thread;
public class Thread3 extends Thread{
public void run(){
System.out.println("---end---");
}
}
package Thread;
public class addShutdownHookTest{
public static void main(String[] args) {
Runtime.getRuntime().addShutdownHook(new Thread3());
Thread1 t1 = new Thread1();
t1.start();
Thread2 t2 = new Thread2();
t2.start();
}