Java ThreadGroup setDaemon() 方法

2024 年 11 月 11 日 | 阅读 1 分钟

ThreadGroup 类的 setDaemon() 方法用于测试线程组是否为守护线程组。

语法

参数

daemon：如果为 true，则将线程组标记为守护线程组；否则，将其标记为普通线程组。

Exception

SecurityException：如果当前线程无法修改该线程组。

示例

class NewThread extends Thread 
{
    NewThread(String threadname, ThreadGroup tg)
    {
        super(tg, threadname);
    }
    public void run()
    {
        for(int i = 0;i < 10;i++) 
        {
            i++;
        }
        System.out.println(Thread.currentThread().getName() + " completed executing");
    }
}
public class ThreadGroupSetDaemonExp 
{
    public static void main(String arg[]) throws InterruptedException,
        SecurityException, Exception
    {
        // creating a parent threadGroup
        ThreadGroup tg1 = new ThreadGroup("Parent thread");
        tg1.setDaemon(true);

        // creating a child threadGroup 
        ThreadGroup tg2 = new ThreadGroup(tg1, "Child thread");
        tg2.setDaemon(false);

        // creating a thread 
        NewThread t1 = new NewThread("Thread-1", tg1);
        t1.start();

       // creating another thread 
        NewThread t2 = new NewThread("Thread-2", tg2);
        t2.start();

        // returns true if this thread group is a daemon thread group
        System.out.println("Is " + tg1.getName() + " a daemon threadGroup? " + tg1.isDaemon());
        System.out.println("Is " + tg2.getName() + " a daemon threadGroup? " + tg2.isDaemon());
    }
}

输出

Is Parent thread a daemon threadGroup? true
Is Child thread a daemon threadGroup? false
Thread-1 completed executing
Thread-2 completed executing

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Java ThreadGroup setDaemon() 方法

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示例

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Java ThreadGroup setDaemon() 方法

语法

参数

Exception

示例

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