JAVA——利用wait和notify实现生产者和消费者-白红宇

JAVA——利用wait和notify实现生产者和消费者

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发布时间：2019-06-28

本文共 2444 字，大约阅读时间需要 8 分钟。

经典的消费者和生产者的的实现：

注意事项：

　　1：在循环里面用wait（），因为当线程获得了锁，但是有可能还没有满足其他条件：

　　2：公用的缓冲池要用锁机制：

1 package demo; 2  3 import java.util.Vector; 4  5 public class Main { 6  7     public static void main(String[] args) { 8         Vector
     
       pool=new Vector
      
       (); 9         Producer producer=new Producer(pool, 4);10         Consumer consumer=new Consumer(pool);11         new Thread(producer).start();12         new Thread(consumer).start();13     }14 15 }16 17 //生产者18 class Producer implements Runnable{19     private Vector pool;20     private Integer size;21     22     public Producer(Vector pool, Integer size) {23         this.pool = pool;24         this.size = size;25     }26     @Override27     public void run() {28         for(int i=0;i<7;i++){29             try {30                 System.out.println("produce "+i);31                 produce(i);32             } catch (InterruptedException e) {33                 // TODO Auto-generated catch block34                 e.printStackTrace();35             }36         }37     }38     private void produce(int i) throws InterruptedException{39         while(pool.size()==size){40             synchronized (pool) {41                 System.out.println("pool is full Producer is waiting,size is "+pool.size());42                 pool.wait();43             }44         }45         synchronized (pool) {46             pool.add(i);47             pool.notifyAll();48         }49     }50 }51 52 53 //消费者54 class Consumer implements Runnable{55     private Vector pool;56     public Consumer(Vector pool) {57         this.pool = pool;58     }59     60     @Override61     public void run() {62         for(int i=0;i<7;i++){63             try {64                 System.out.println("consume "+i);65                 consume();66             } catch (InterruptedException e) {67                 // TODO Auto-generated catch block68                 e.printStackTrace();69             }70         }71     }72     73     private void consume() throws InterruptedException{74         while(pool.isEmpty()){75             synchronized (pool) {76                 System.out.println("pool is empty Consumer is waiting,size is "+pool.size());77                 pool.wait();78             }79         }80         synchronized (pool) {81             pool.notifyAll();82             pool.remove(0);83             84         }85     }86 }

执行结果是：