• Deamon Thread 讲解


    The daemon thread's life cycle is same with the life cycle of the application which starts this daemon thread. If the application finishes, daemon threads are terminated at the same time. An example for a daemon thread is the garbage collection.

    "Daemon Thread" is also called "Service Thread"; normal threads are called "User Thread".

    Additionally, please do not use daemon threads to do I/O operations.


    The following example is that one application starts a user thread which runs a daemon thread with infinity loop.

    The user thread dies first, but the daemon thread continues.

    If the application dies, the daemon thread is dead immediately.


    public class DaemonThread extends Thread {
        public DaemonThread() {
            this.setDaemon(true);
        }
        @Override
        public void run() {
            while (true) {
                System.out.println("Begin to sleep.");
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("Wake up.");
            }
        }
    }


    public class MainApp implements Runnable{
        
        @Override
        public void run(){
            DaemonThread dt = new DaemonThread();
            dt.start();
            System.out.println("The user thread is terminated.");
        }

        public static void main(String[] args) {
            Thread thread = new Thread(new MainApp());
            thread.start();
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("The main thread is terminated.");
        }

    }


    Output:

    The user thread is terminated.
    Begin to sleep.
    Wake up.
    Begin to sleep.
    Wake up.
    Begin to sleep.
    The main thread is terminated.

  • 相关阅读:
    Redis的安装与使用
    jQuery操作input值总结
    jquery获得select option的值和对select option的操作
    jsp弹出新窗口代码
    MyEclipse10.0优化
    MyEclipse安装FreeMarker插件
    增强MyEclipse的代码自动提示功能
    PowerDesigner 技巧【3】
    PowerDesigner 快捷键
    PowerDesigner 技巧【2】
  • 原文地址:https://www.cnblogs.com/javawebsoa/p/3199033.html
Copyright © 2020-2023  润新知