class NewThread implements Runnable 
{
   private String msg;

   public NewThread(String s)
   {
      msg = s;
   }

   // Interface method
   public void run() 
   {
      System.out.println(msg);
   }
}

public class ThreadDemo1 
{
   public static void main(String args[])  throws InterruptedException
   {
      Runnable p1, p2, p3, p4;
      Thread t1, t2, t3, t4;

      p1 = new NewThread("Hello");
      p2 = new NewThread("Bye");
      p3 = new NewThread("ABC");
      p4 = new NewThread("123");

      t1 = new Thread(p1);
      t2 = new Thread(p2);
      t3 = new Thread(p3);
      t4 = new Thread(p4);

      t1.start();
      t2.start();
      t3.start();
      t4.start();

      System.out.println("Waiting for threads to exit");
      t1.join();
      t2.join();
      t3.join();
      t4.join();
      System.out.println("Done");

   }
}