Java Data Type Tutorial - Java ThreadGroup(ThreadGroup parent, String name) Constructor

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Syntax

ThreadGroup(ThreadGroup parent, String name) constructor from ThreadGroup has the following syntax.

public ThreadGroup(ThreadGroup parent,    String name)

Example

In the following code shows how to use ThreadGroup.ThreadGroup(ThreadGroup parent, String name) constructor.

//from   w ww  .  ja  va  2 s. c  o  m
class MyThread extends Thread {
   MyThread(ThreadGroup group, String name) {
      super(group, name);
   }

   public void run() {
      System.out.println(Thread.currentThread().getName() + " starting.");
      try {
        Thread.sleep(5000);
      }
      catch(Exception e) {
         System.out.print(Thread.currentThread().getName());
         System.out.println(" interrupted.");
      }
      System.out.println(Thread.currentThread().getName() + " exiting.");
   }
}

public class Main {

   public static void main(String args[]) throws Exception {

     ThreadGroup group = new ThreadGroup("Group");

     ThreadGroup newGroup = new ThreadGroup(group,"new group");
     
     MyThread t1 = new MyThread(group, "Thread1");
     MyThread t2 = new MyThread(group, "Thread2");
   
     t1.start();
     t2.start();
   
     Thread.sleep(1000);

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

     Thread th[] = new Thread[group.activeCount()];
     group.enumerate(th);
     for(Thread t : th){
        System.out.println(t.getName());
     }
     Thread.sleep(1000);
    
     System.out.println(group.activeCount() + " threads in thread group...");

     group.interrupt();
  }
}

The code above generates the following result.

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