用JAVA中的多线程示例生产者和消费者问题

class Producer implements Runnable  { 
private SyncStack stack; 

    public Producer(SyncStack stack) { 
    this.stack = stack; 
} 

    public void run() { 
      for (int i = 0; i < stack.getProducts().length; i++) { 
          String product = "产品"+i; 
          stack.push(product); 
          System.out.println("生产了: "+product); 
          try 
          { 
            Thread.sleep(200); 
          } 
          catch(InterruptedException e) 
          { 
            e.printStackTrace(); 
          } 


      } 
    } 
    
} 

class Consumer implements Runnable { 
    private SyncStack stack; 

    public Consumer(SyncStack stack) { 
    this.stack = stack; 
} 
    public void run() { 
      for(int i=0;i <stack.getProducts().length;i++)  { 
          String product =stack.pop(); 
          System.out.println("消费了: "+product); 
          try  { 
            Thread.sleep(1000); 
          } 
          catch(InterruptedException e)  { 
            e.printStackTrace(); 
          } 
          } 
    } 
} 

class SyncStack { 
    private String[] products = new String[10]; 
    private int index; 
    public synchronized void push(String product) { 
      if(index==product.length()) { 
          try { 
              wait(); 
          } catch (InterruptedException e) { 
              // TODO Auto-generated catch block 
              e.printStackTrace(); 
          } 
      } 
      notify(); 
      products[index]=product; 
      index++; 
    } 
    
    public synchronized String pop() { 
      if(index==0) { 
          try { 
              wait(); 
          } catch (InterruptedException e) { 
              // TODO Auto-generated catch block 
              e.printStackTrace(); 
          } 
      } 
      notify(); 
      index--; 
      String product = products[index]; 
      return product; 
    } 

    public String[] getProducts() { 
      return products; 
    } 
    
    
} 
public class TestProducerConsumer { 
    
    public static void main(String[] args) { 
      SyncStack stack=new SyncStack(); 
      Producer p=new Producer(stack); 
      Consumer c=new Consumer(stack); 

      new Thread(p).start(); 
      new Thread(c).start(); 
      } 
    }