Use a ThreadGroup. : Simple Threads « Threads « Java

Use a ThreadGroup.


class MyThread extends Thread {
  boolean stopped;

  MyThread(ThreadGroup tg, String name) {
    super(tg, name);
    stopped = false;

  public void run() {
    System.out.println(Thread.currentThread().getName() + " starting.");
    try {
      for (int i = 1; i < 1000; i++) {
        synchronized (this) {
          if (stopped)
    } catch (Exception exc) {
      System.out.println(Thread.currentThread().getName() + " interrupted.");
    System.out.println(Thread.currentThread().getName() + " exiting.");

  synchronized void myStop() {
    stopped = true;

public class Main {
  public static void main(String args[]) throws Exception {
    ThreadGroup tg = new ThreadGroup("My Group");

    MyThread thrd = new MyThread(tg, "MyThread #1");
    MyThread thrd2 = new MyThread(tg, "MyThread #2");
    MyThread thrd3 = new MyThread(tg, "MyThread #3");



    System.out.println(tg.activeCount() + " threads in thread group.");

    Thread thrds[] = new Thread[tg.activeCount()];
    for (Thread t : thrds)


    System.out.println(tg.activeCount() + " threads in tg.");


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