/* Threads yield randomly after printing number */            

public class Test4 {

  final static int NUM_THREADS = 10;

  public static void main(String[] argv){
    MyThread4[] myThreads = new MyThread4[NUM_THREADS];
    for (int i=0; i < NUM_THREADS; i++)
      (myThreads[i] = createThread(i)).start();
    for (int i=0; i < NUM_THREADS; i++)
      try {
	myThreads[i].join();
      } catch (InterruptedException e){
	return;
      }
    System.out.println();
  }

  public static MyThread4 createThread(int i){
    return new MyThread4(new Integer(i).toString());
  }
}

class MyThread4 extends Thread{

  final static int NUM_PRINTS = 30;

  MyThread4(String s){
    super(s);
  }

  public void run(){
    for (int i=0; i < NUM_PRINTS; i++){
      System.out.print(getName());
      if (Math.random() < 0.5) yield();
    }
  }
}