多线程06.thread守护线程

package chapter2;

public class Demo02 {
    public static void main(String[] args) {
Thread th1=new Thread(){
    @Override
    public void run() {
        //主线程
        Thread th2=new Thread(){

            //守护线程
            @Override
            public void run() {
                try {
                    Thread.sleep(1_000);
                    System.out.println("T thread finish done.");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }
        };
       // 当th1.setDaemon(true)，即t为Daemon线程时，主线程结束，守护线程也结束
        th2.setDaemon(true);
        th2.start();
        try { while (true) {
            System.out.println("Do some thing for health check.");
            Thread.sleep(1_000);
        }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
};
            th1.start();

    }
}