[Java] Thread.setDaemon(boolean) 后台进程

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