Java Long class

Java Thread destroy() method

Last Updated : 17 Mar 2025

The destroy() method of thread 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

public class JavaDestroyExp extends Thread 
{
    JavaDestroyExp(String threadname, ThreadGroup tg)
    {
        super(tg, threadname);
        start();
    }
    public void run()
    {
        for (int i = 0; i < 2; i++) 
        {
            try
            {
                Thread.sleep(10);
            }
            catch (InterruptedException ex) {
                System.out.println("Exception encounterted");}
        }
        System.out.println(Thread.currentThread().getName() +
              " finished executing");
    }
    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 
        JavaDestroyExp t1 = new JavaDestroyExp("Thread-1", g1);
        // creating another thread 
        JavaDestroyExp t2 = new JavaDestroyExp("Thread-2", g1);
        
        // block until other thread is finished
        t1.join();
        t2.join();
 
        // destroying child thread
        g2.destroy();
        System.out.println(g2.getName() + " destroyed");
        
        // destroying parent thread
        g1.destroy();
        System.out.println(g1.getName() + " destroyed");
    }
}

Output:

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

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Java Thread destroy() method

Syntax

Return

Exception