如何在Java中更改线程组的名称？

Question

我对多线程很陌生,所以我要问的问题可能很简单.

在我的程序中,有两个线程,一个是主线程,第二个是mythread.

package multithreading;

public class ThreadDemo {
    public static void main(String args[]) {        
        System.out.println(Thread.currentThread());
        new MyThread();
        try {
            for(int i = 1; i<=5; i++) {                             
                Thread.sleep(1000);
            }

        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }


}

class MyThread extends Thread {
    public MyThread() {     
        start();
    }

    public void run() {
        Thread.currentThread().setName("mythread");
        System.out.println(Thread.currentThread());
        for(int i = 1; i<=5; i++) {
            try {
                Thread.sleep(500);
                //System.out.println("MyThread i value "+i);

            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

现在,程序的输出是,

Thread[main,5,main]
Thread[mythread,5,main]

我知道输出意味着什么.

但我想将mythread的线程组更改为我自己而不是main.我怎样才能做到这一点？

什么Java方法用于更改线程的线程组？

通过更改线程组会有任何问题吗？

Answer 1

我建议实现Runnable而不是扩展Thread.然后,您可以使用自己的组轻松创建新线程:

public class ThreadDemo {
   public static void main(String args[]) {
        System.out.println(Thread.currentThread());
        Runnable r = new MyRunnable();
        new Thread(new ThreadGroup("my group"), r).start();
        try {
            for (int i = 1; i <= 5; i++) {
                Thread.sleep(1000);
            }

        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

class MyRunnable implements Runnable {

    public void run() {
        Thread.currentThread().setName("mythread");
        System.out.println(Thread.currentThread());
        for (int i = 1; i <= 5; i++) {
            try {
                Thread.sleep(500);
                //System.out.println("MyThread i value "+i);

            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}