import java.util.Random;

public class Tester {
  public static void main(String[] args) {
    Random rand = new Random();

    MyRunnable r1 = new MyRunnable("MyRunnable 1", 1000 + rand.nextInt(200) );
    MyRunnable r2 = new MyRunnable("MyRunnable 2", 1000 + rand.nextInt(200) );
    MyRunnable r3 = new MyRunnable("MyRunnable 3", 1000 + rand.nextInt(200) );
    
    Thread t1 = new Thread(r1);
    Thread t2 = new Thread(r2);
    Thread t3 = new Thread(r3);    

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

    Thread t4 = new MyThread("MyThread 4", 1000 + rand.nextInt(200));
    t4.start();
  }
}