class Repeater

public class Repeater extends Thread {

      private String id;

      private int count;

      public Repeater(String id, int count) {

            this.id = id;

            this.count = count;

      }

      public void run() {

            do {

                  System.out.println(id + ": " + count);

                  count--;

                  try {

                        Thread.sleep(1000); // 1000ms = 1s

                  } catch (InterruptedException ignore) {

                  }

            } while (count > 0);

            System.out.println(id + ": end");

      }

}          

class WaitingRepeaters

public class WaitingRepeaters {

      public static void main(String[] args)

            throws InterruptedException {

            Repeater threadA = new Repeater("A", 2);

            Repeater threadB = new Repeater("B", 5);

            threadA.start();

            threadB.start();

            System.out.println("Repeaters ...");

            threadA.join();

            System.out.println("A joins");

      }

}    

> java WaitingRepeaters

A: 2

Repeaters ...

B: 5

A: 1

B: 4

A: end

B: 3

A joins

B: 2

B: 1

B: end