class lesson07
{
 private int index=0;
 private char []buffer=new char[6];
 public synchronized void push(char c)
 {
  while(index==buffer.legth)
  {
   try
  {
   this.wait();
   }
   catch(InterruptedException e)
   {
    }
    }
    this.notify();
    buffer[index]=c;
    index++;
    }
    public synchronized char pop()
    {
     while(index==0)
     {
      try
      {
      this.wait();
      }
      catch(InterruptedException e)
      {
       }
       }
       this.notity();
       index--;
       return buffer[index];
       }
        }
       class Producer implements Runnable
       {
        SyncStack theStack;
        public Producer(SyncStack s)
        {
         theStack=s;
        }
        public void run()
        {
         char c;
         for(int i=0;i<20;i++)
         {
          c=(char)(Math.random()*26+'A');
         theStack.push(c);
         System.out.println("Produced:"+c);
         try
         {
          Thread.sleep((int)(Math.random()*1000));
          }
          catch(InterruptedException e)
          {
           }
           }
           }
           }
           class Consumer implements Runnable
           {
            SyncStack theStack;
            public Consumer(SyncStack s)
            {
             theStack=s;
             }
             public void run()
             {
              char c;
              for(int i=0;i<20;i++)
              {
               c=theStack.pop();
               System.out.println("Consumed;"+c);
               try
               {
                Thread.sleep((int)(Math.random()*1000));
                }
                catch(InterruptedException e)
                {
                 }
                 }
                 }
                 }
                 public class lesson07{
                 public static void main(String []args)
                 {
                  Runnable source=new Producer(Stack);
                  Runnable sink=new Consumer(Stack);
                  Thread t1=new Thread(source);
                  Thread t2=new Thread(sink);
                  t1.start();
                  t2.start();
                  }
                  }

?

这是个完整的程序了   我检查了几遍还是没有看出错在那里啊  希望你们能运行一下 帮我看一下错在那啊~！

你编的程序有错误。我改了以后还是出错，你的程序要求什么的结果。你和我说下。

就是,想实现什么功能啊,你可以说一下

楼主这是个简单的线程练习题吧