Java ThreadGroup suspend() method

The suspend() method of ThreadGroup class is used to suspend all threads in the thread group.

Syntax

Return

This method does not return any value.

Exception

SecurityException: This exception throws if the current thread is not allowed to access the thread group or any of the threads in the thread group.

Example 1

class NewThread extends Thread 
{
    NewThread(String threadname, ThreadGroup tg)
    {
        super(tg, threadname);
    }
    public void run()
    {
        for(int i = 0;i < 10;i++) 
        {
            i++;
        }
        System.out.println(Thread.currentThread().getName() + " completed executing");
    }
}
public class ThreadGroupSuspendExp 
{
    public static void main(String arg[]) throws InterruptedException,
        SecurityException, Exception
    {
        // creating the threadGroup
        ThreadGroup tg1 = new ThreadGroup("Parent thread");
        ThreadGroup tg2 = new ThreadGroup(tg1, "Child thread");

        // creating a thread 
        NewThread t1 = new NewThread("Thread-1", tg1);
        System.out.println("Starting of Thread-1");
        t1.start();
        // creating another thread 
        NewThread t2 = new NewThread("Thread-2", tg2);
        System.out.println("Starting of Thread-2");
        t2.start();
       
        // this will suspend all the threads
        tg1.suspend();
    }
}   

Test it Now

Output:

Starting of Thread-1
Starting of Thread-2

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