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Java ThreadGroup destroy() method with example

ThreadGroup Class destroy() method: Here, we are going to learn about the destroy() method of ThreadGroup Class with its syntax and example.
Submitted by Preeti Jain, on December 23, 2019

ThreadGroup Class destroy() method

  • destroy() method is available in java.lang package.
  • destroy() method is used to destroy this thread group and when we destroy this thread group so its child thread group will be destroyed simultaneously.
  • destroy() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • destroy() method may throw an exception at the time of destroying this thread group.
    • SecurityException – This exception may throw when the current thread is not permitted to update this thread group.
    • IllegalThreadStateException – This exception may throw in two cases
      • When this thread group has already been destroyed.
      • When this thread group is not blank.

Syntax:

    public final void destroy();

Parameter(s):

  • It does not accept any parameter.

Return value:

The return type of this method is void, it returns nothing.

Example:

// Java program to demonstrate the example // of void destroy() method of ThreadGroup public class Destroy implements Runnable { public static void main(String[] args) { Destroy des = new Destroy(); des.destroyed(); } public void destroyed() { try { // Create two thread group and the named are base // and derived ThreadGroup base = new ThreadGroup("Base ThreadGroup"); ThreadGroup derived = new ThreadGroup(base, "Derived ThreadGroup"); // create two threads Thread th1 = new Thread(base, this); Thread th2 = new Thread(derived, this); //By using getName() method is to retrieve the // name of the thread th1 System.out.println(th1.getName() + " " + "begins....."); // By using start() method is to start its execution // of thread th1 th1.start(); //By using getName() method is to retrieve the // name of the thread th2 System.out.println(th2.getName() + " " + "begins....."); // By using start() method is to start its execution // of thread th2 th2.start(); System.out.println(); // By using join() method is to wait the current // thread till complete execution of another // thread th1.join(); th2.join(); // By using destroy() method is to // destroy the thread group named derived derived.destroy(); boolean b1 = derived.isDestroyed(); System.out.println(derived.getName() + " " + "destroyed" + " " + b1); boolean b2 = base.isDestroyed(); System.out.println(base.getName() + " " + "destroyed" + " " + b2); } catch (InterruptedException ex) { ex.printStackTrace(); } } // Override run() public void run() { for (int k = 0; k < 100; ++k) ++k; System.out.println(Thread.currentThread().getName() + " " + "ends....."); } }

Output

Thread-0 begins.....
Thread-0 ends.....
Thread-1 begins.....

Thread-1 ends.....
Derived ThreadGroup destroyed true
Base ThreadGroup destroyed false
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