Java ThreadGroup destroy() method with Examples

by Online Tutorials Library July 22, 2022

Java ThreadGroup destroy() method

The destroy() method of ThreadGroup class is used to destroy the thread group and all of its subgroups. The thread group must be empty, indicating that all threads that had been in the thread group have since stopped.

Syntax:

Return:

It doesn’t return any value.

Exception:

IllegalThreadStateException: This exception throws if the thread group is not empty or if the thread group has already been destroyed.

SecurityException: If the current thread cannot modify this thread group.

Example

  class NewThread extends Thread   {      NewThread(String threadname, ThreadGroup tg)      {          super(tg, threadname);      }      public void run()      {          for (int i = 0; i < 10; i++)           {              try              {                  Thread.sleep(10);              }              catch (InterruptedException ex)               {                System.out.println(Thread.currentThread().getName() + ” interrupted”);              }          }          System.out.println(Thread.currentThread().getName() +  ” completed executing”);      }  }   public class ThreadGroupDestroyExp  {      public static void main(String arg[]) throws InterruptedException, SecurityException      {          // creating a ThreadGroup          ThreadGroup g1 = new ThreadGroup(“Parent thread”);          // creating a child ThreadGroup for parent ThreadGroup          ThreadGroup g2 = new ThreadGroup(g1, “Child thread”);                    // creating a thread           NewThread t1 = new NewThread(“Thread-1”, g1);          t1.start();          // creating another thread           NewThread t2 = new NewThread(“Thread-2″, g1);          t2.start();                    // block until other thread is finished          t1.join();          t2.join();             // destroying child threadGroup          g2.destroy();          System.out.println(g2.getName() + ” destroyed”);                    // destroying parent threadGroup          g1.destroy();          System.out.println(g1.getName() + ” destroyed”);      }  }  

Test it Now

Output:

Thread-1 finished executing  Thread-2 finished executing  Child thread destroyed  Parent thread destroyed

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