class Producer extends Thread {  private CubbyHole cubbyhole;  private int number;  public Producer(CubbyHole c, int number) {	cubbyhole = c;	this.number = number;  }  public void run() {	for (int i = 0; i < 10; i++) {	   cubbyhole.put(i);	   System.out.println("Producer #" + this.number + " put: " + i);	   try {		sleep((int)(Math.random() * 100));	   } catch (InterruptedException e) {	   }	}  }}