Java——多生产者多消费者

╰+攻爆jí腚メ 2022-06-07 06:51 177阅读 0赞

//使用jdk1.5的多线程实现方式实现可以同时多生产多消费的功能
    //跟之前的博客类似，就是多了个容器，从而实现多生产多消费的功能
    import java.util.concurrent.locks.*;
    //描述产品
    class Clothes{
        //产品名称
        private String name;
        //产品价格
        private double price;
        //存放产品的容器
        private Clothes[] arr = new Clothes[100];
        //创建一把锁
        private Lock lock = new ReentrantLock();
        //创建和锁绑定的Condition对象，控制生产线程
        private Condition pro = lock.newCondition();
        //创建和锁绑定的Condition对象，控制消费线程
        private Condition con = lock.newCondition();
        //生产使用的下标
        private int propointer;
        //消费使用的下标
        private int conpointer;
        //记录产品数量
        private int count;
    
        public Clothes(){}
    
        public Clothes(String name,double price){
            this.name = name;
            this.price = price;
        }
        //生产功能
        public void produce(){
            lock.lock();
            try{
                //先判断该不该生产，当容器满的时候不能生产
                while(count==arr.length){
                    try{pro.await();}catch(InterruptedException e){e.printStackTrace();}
                }
                arr[propointer] = new Clothes("衬衣",99.99);
                System.out.println(Thread.currentThread().getName()+"...生产了..."+arr[propointer]+"..."+count);
                count++;//数量+1
                if(++propointer==arr.length)
                    propointer = 0;
                con.signal();
            }
            finally{
                lock.unlock();
            }
        }
        //消费功能
        public void consume(){
            lock.lock();
            try{
                //先判断该不该消费，当商品数量为0的时候不能消费
                while(count==0){
                    try{con.await();}catch(InterruptedException e){e.printStackTrace();}
                }
                Clothes yifu = arr[conpointer];
                System.out.println(Thread.currentThread().getName()+"...消费了..."+yifu);
                count--;
                if(++conpointer==arr.length)
                    conpointer = 0;
                pro.signal();
            }
            finally{
                lock.unlock();
            }
        }
    
            public String toString(){
                return name+","+price;
            }
    }
    //生产任务
    class Producer implements Runnable{
        private Clothes clo;
        public Producer(Clothes clo){
            this.clo = clo;
        }
        public void run(){
            while(true){
                clo.produce();
            }
        }
    }
    //消费任务
    class Consumer implements Runnable{
        private Clothes clo;
        public Consumer(Clothes clo){
            this.clo = clo;
        }
        public void run(){
            while(true){
                clo.consume();
            }
        }
    }
    
    
    class test{
        public static void main(String[] args){
            Clothes clo = new Clothes();
    
            Producer producer = new Producer(clo);
            Consumer consumer = new Consumer(clo);
    
            Thread t1 = new Thread(producer);
            Thread t2 = new Thread(producer);
    
            Thread t3 = new Thread(consumer);
            Thread t4 = new Thread(consumer);
    
            t1.start();
            t2.start();
            t3.start();
            t4.start();
        }
    }