主线程结束，其他线程正常运行

public class ParentTest  
{  

    public static void main(String[] args)  
    {  
        System.out.println("parent thread begin ");  

        ChildThread t1 = new ChildThread("thread1");  
        ChildThread t2 = new ChildThread("thread2");  
        t1.start();  
        t2.start();  

        System.out.println("parent thread over ");  
    }  
}  

class ChildThread extends Thread  
{  
    private String name = null;  

    public ChildThread(String name)  
    {  
        this.name = name;  
    }  

    @Override  
    public void run()  
    {  
        System.out.println(this.name + "--child thead begin");  

        try  
        {  
            Thread.sleep(500);  
        }  
        catch (InterruptedException e)  
        {  
            System.out.println(e);  
        }  

        System.out.println(this.name + "--child thead over");  
    }  
}

程序运行结果如下:

parent thread begin   
parent thread over   
thread2--child thead begin  
thread1--child thead begin  
thread2--child thead over  
thread1--child thead over

主线程结束，其他守护线程立刻结束

提示： 主线程不能设置成守护线程

public class ParentTest  
{  

    public static void main(String[] args)  
    {  
        System.out.println("parent thread begin ");  

        ChildThread t1 = new ChildThread("thread1");  
        ChildThread t2 = new ChildThread("thread2");  
        t1.setDaemon(true);  
        t2.setDaemon(true);  

        t1.start();  
        t2.start();  

        System.out.println("parent thread over ");  
    }  
}  
class ChildThread extends Thread  
{  
    private String name = null;  
    public ChildThread(String name)  
    {  
        this.name = name;  
    }  
    @Override  
    public void run()  
    {  
        System.out.println(this.name + "--child thead begin");  
        try  
        {  
            Thread.sleep(500);  
        }  
        catch (InterruptedException e)  
        {  
            System.out.println(e);  
        }  
        System.out.println(this.name + "--child thead over");  
    }  
}

执行结果如下：

parent thread begin  
parent thread over  
thread1--child thead begin  
thread2--child thead begin

参考：
https://www.cnblogs.com/qiumingcheng/p/8202393.html

原文出处：/show_1IX63hmnRKwP.html