Application.java

public class Application
{
    public static void main(String[] args)
    {
        System.out.println("Main thread started ");

        ThreadA threadA = new ThreadA();
        threadA.start();
        System.out.println("ThreadA was started");

        try {
            System.out.println("Main thread is waiting until ThreadA completes");
            threadA.join();
            System.out.println("Main thread resumed again after completing ThreadA");
        } catch (InterruptedException e) {
            System.out.println("waiting thread interrupted ");
        }
        System.out.println("Main thread completed ");
    }
}


class ThreadA extends Thread
{
    public void run()
    {
        System.out.println("ThreadA is running");
        try {
            System.out.println("ThreadA sleeps for 5 seconds");
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            System.out.println("sleeping thread interrupted ");
        }
        System.out.println("ThreadA completed");
    }
}