public class Thread5{ public static void main(String[] args){ Thread t1 = new RunnableTest5(10); t1.setName("用户线程t1"); t1.start(); Thread t2 = new RunnableTest5(100); t2.setDaemon(true);//设置为后能进程 t2.setName("后台线程t2"); t2.start(); for(int i=0;i<10;i++){ System.out.println(Thread.currentThread().getName()+":"+i); } System.out.println(Thread.currentThread().getName()+"结束了"); } } class RunnableTest5 extends Thread{ private int n; public RunnableTest5(int n){ this.n = n; } @Override public void run(){ for(int i=0;i<n;i++){ System.out.println(this.getName()+":"+i); } System.out.println(this.getName()+"结束"); } } //运行结果，main进程和t1进程都会运行完，但是设置成后台进程的t2将不一定运行完 //java虚拟机会在用户进程和main进程结束后，就退出java虚拟机,所以 后台进程不能执行完
