并发编程：苹果箱生产者消费者模式-优快云博客

本文探讨了并发编程中的苹果箱生产者消费者模式，通过使用Java的线程和同步机制，实现了一个简单的多线程应用，展示了如何在多线程环境下安全地进行资源的存取操作。

public class Test {


   public static void main(String[] args) {
       AppleBox ab=new AppleBox();

       Producer p=new Producer(ab);
       Consumer c=new Consumer(ab);
       Consumer cd=new Consumer(ab);

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

       new Thread(cd).start();

   }

}

class Apple{
   int id;
   Apple(int id){
       this.id=id;
   }
   public String toString(){
       return "apple "+id;
   }
}

class AppleBox{
   int index=0;
   Apple[] apples=new Apple[5];


   public synchronized void deposite(Apple apple){
       while(index==apples.length){
           try {
               this.wait();
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
       }
       this.notifyAll();
   //   System.out.println(Thread.currentThread().getName()+"开始放入苹果了");
       apples[index]=apple;
       index++;
   }

   public synchronized Apple withdraw(){
       while(index==0){
           try {
               this.wait();
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
       }
       this.notifyAll();
       //System.out.println(Thread.currentThread().getName()+"开始取出苹果了");
       index--;
       return apples[index];
   }

}

class Producer implements Runnable{
   AppleBox ab=null;
   Producer(AppleBox ab){
       this.ab=ab;
   }
   @Override
   public void run() {
       for(int i=0;i<20;i++){
           Apple a=new Apple(i);
           ab.deposite(new Apple(i));
           System.out.println(Thread.currentThread().getName()+"生产了:"+a);
           try {
               Thread.sleep((int)(Math.random()*1000));
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
       }
   }

}

class Consumer implements Runnable{
   AppleBox ab=null;
   Consumer(AppleBox ab){
       this.ab=ab;
   }
   @Override
   public void run() {
       for(int i=0;i<20;i++){
           Apple a=ab.withdraw();
           System.out.println(Thread.currentThread().getName()+"消费了"+a);
           try {
               Thread.sleep((int)(Math.random()*1000));
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
       }
   }

}