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Java守护线程daemon介绍

发布时间 2023-05-07 22:23:49作者: 妖妖领先

1.介绍

  • 线程分为用户线程和守护线程
  • JVM必须确保用户线程执行完毕，但是不用等待守护线程执行完毕

示例代码:

public class TestDaemon {
    public static void main(String[] args) {
        DaemonThread daemon = new DaemonThread();
        CustomerThread customer = new CustomerThread();

        Thread thread1 = new Thread(daemon);
        thread1.setDaemon(true);  // 默认是false是用户线程

        Thread thread2 = new Thread(customer);

        // 执行
        thread1.start();
        thread2.start();
    }
}

class DaemonThread implements Runnable {
    @Override
    public void run() {
        while (true) {
            System.out.println("God bless you!");
        }
    }
}

class CustomerThread implements Runnable {
    @Override
    public void run() {
        for (int i = 0; i < 1000; i++) {
            System.out.println("process:" + i);
        }
        System.out.println("customer thread end.");
    }
}

执行结果：
image
用户线程执行完毕后，JVM则停止，不管守护线程