守护线程和用户线程

public class ThreadDemo {
    public static void main(String[] args) {
        Thread userThread = new Thread(new Runnable() {
            public void run() {
                try {
                    Thread.sleep(5000);
                    System.out.println("用户线程执行完毕");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        userThread.start();

        Thread daemonThread = new Thread(new Runnable() {
            public void run() {
                while (true) {
                    System.out.println("守护线程正在运行");
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        });
        daemonThread.setDaemon(true);
        daemonThread.start();

        System.out.println("主线程执行完毕");
    }
}