|NO.Z.00100|——————————|BigDataEnd|——|Java&多线程.V12|——|Java.v12|守护线程|

一、守护线程

package com.yanqi.task18;

public class ThreadDaemonTest extends Thread {
    @Override
    public void run() {
        //System.out.println(isDaemon()? "该线程是守护线程": "该线程不是守护线程"); // 默认不是守护线程
        // 当子线程不是守护线程时，虽然主线程先结束了，但是子线程依然会继续执行，直到打印完毕所有数据为止
        // 当子线程是守护线程时，当主线程结束后，则子线程随之结束
        for (int i = 0; i < 50; i++) {
            System.out.println("子线程中：i = " + i);
        }
    }

    public static void main(String[] args) {

        ThreadDaemonTest tdt = new ThreadDaemonTest();
        // 必须在线程启动之前设置子线程为守护线程
        tdt.setDaemon(true);
        tdt.start();

        for (int i = 0; i < 20; i++) {
            System.out.println("-------主线程中：i = " + i);
        }
    }
}

二、 编译打印

D:\JAVA\jdk-11.0.2\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=50782:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath E:\NO.Z.10000——javaproject\NO.H.00001.javase\javase\out\production\javase com.yanqi.task18.ThreadDaemonTest
子线程中：i = 0
子线程中：i = 1
子线程中：i = 2
子线程中：i = 3
子线程中：i = 4
子线程中：i = 5
子线程中：i = 6
子线程中：i = 7
子线程中：i = 8
子线程中：i = 9
子线程中：i = 10
子线程中：i = 11
子线程中：i = 12
-------主线程中：i = 0
子线程中：i = 13
-------主线程中：i = 1
子线程中：i = 14
-------主线程中：i = 2
-------主线程中：i = 3
-------主线程中：i = 4
-------主线程中：i = 5
子线程中：i = 15
-------主线程中：i = 6
子线程中：i = 16
-------主线程中：i = 7
子线程中：i = 17
-------主线程中：i = 8
子线程中：i = 18
-------主线程中：i = 9
子线程中：i = 19
-------主线程中：i = 10
子线程中：i = 20
-------主线程中：i = 11
子线程中：i = 21
-------主线程中：i = 12
子线程中：i = 22
-------主线程中：i = 13
子线程中：i = 23
-------主线程中：i = 14
子线程中：i = 24
-------主线程中：i = 15
子线程中：i = 25
-------主线程中：i = 16
子线程中：i = 26
-------主线程中：i = 17
子线程中：i = 27
-------主线程中：i = 18
子线程中：i = 28
-------主线程中：i = 19
子线程中：i = 29
子线程中：i = 30
子线程中：i = 31
子线程中：i = 32
子线程中：i = 33
子线程中：i = 34
子线程中：i = 35
子线程中：i = 36
子线程中：i = 37
子线程中：i = 38
子线程中：i = 39
子线程中：i = 40
子线程中：i = 41
子线程中：i = 42
子线程中：i = 43
子线程中：i = 44
子线程中：i = 45
子线程中：i = 46
子线程中：i = 47
子线程中：i = 48
子线程中：i = 49

Process finished with exit code 0

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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