class Food{
    static boolean flag = true;    // 设 true 需要生产
    public synchronized void proFood(){
    if(!flag){
        try{
        super.wait();
        }catch(InterruptedException e){
        e.printStackTrace();
        }
    }
    try{
    Thread.sleep(100);
    }catch(InterruptedException e){
        e.printStackTrace();
    }
    System.out.println("pppppppppp");
    flag = false;
    super.notify();
    }

    public synchronized void conFood(){
    if(flag){
        try{
        super.wait();
        }catch(InterruptedException e){
        e.printStackTrace();
        }
    }
    try{
        Thread.sleep(1);
    }catch(InterruptedException e){
        e.printStackTrace();
    }    
    System.out.println("ccccccccc");
    flag = true;
    super.notify();    
    }
}

class Producer implements Runnable{
    Food f = new Food();
    public static int howMany;
    Producer(int howMany){
    this.howMany = howMany;
    }
    public void run(){
    for(int i = 0; i < howMany; i++){
        f.proFood();
     }
   } 
}

class Consumer implements Runnable{
    Food f = new Food();
    public void run(){
    for(int i = 0; i < Producer.howMany; i++){
        f.conFood();
    }
    }
}
public class Test {
    public static void main(String args[]) throws Exception{
        Producer p = new Producer(10);
        Consumer c = new Consumer();
        new Thread(p).start();
        new Thread(c).start();    
    }
}