Java示例-生产者消费者问题

public class ProducerConsumerTest {
   public static void main(String[] args) {
      CubbyHole c = new CubbyHole();
      Producer p1 = new Producer(c, 1);
      Consumer c1 = new Consumer(c, 1);
      p1.start();
      c1.start();
   }
}

class CubbyHole {
   private int contents;
   private boolean available = false;

   public synchronized int get() {
      while (available == false) {
         try {
            wait();
         } catch (InterruptedException e) {}
      }
      available = false;
      notifyAll();
      return contents;
   }

   public synchronized void put(int value) {
      while (available == true) {
         try {
            wait();
         } catch (InterruptedException e) { }
      }
      contents = value;
      available = true;
      notifyAll();
   }
}

class Consumer extends Thread {
   private CubbyHole cubbyhole;
   private int number;

   public Consumer(CubbyHole c, int number) {
      cubbyhole = c;
      this.number = number;
   }

   public void run() {
      int value = 0;
      for (int i = 0; i < 10; i++) {
         value = cubbyhole.get();
         System.out.println("Consumer #" + this.number + " got: " + value);
      }
   }
}

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) { }
      }
   }
}