java生产者与消费者问题无法运行

java生产者与消费者问题无法运行

```java
class Clerk{
    private int productCount=0;
    //生产产品
    public synchronized void produceProduct() {
        if(productCount<20){
            productCount++;
            System.out.println(Thread.currentThread().getName()+"生产者开始生产第"+productCount+"个产品");
        }else{
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
    //消费产品
    public synchronized void consumeProduct() {
        if(productCount>0){
            System.out.println(Thread.currentThread().getName()+"开始消费第"+productCount+"个产品");
            productCount--;
        }else{
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }


    }
}
class Producer extends Thread{//生产者
    private Clerk clerk;
    public Producer(Clerk clerk){
        this.clerk=clerk;
    }

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+"开始生产产品.....");
        while(true){

            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.produceProduct();
        }

    }
}
class Consumer extends Thread {//消费者
    private Clerk clerk;

    public Consumer(Clerk clerk) {
        this.clerk = clerk;
    }

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + "开始消费产品.....");
        while (true) {
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.consumeProduct();
        }
    }

    public  class ProductTest {
        public static void main(String[] args) {
            Clerk clerk = new Clerk();
            Producer p1 = new Producer(clerk);
            p1.setName("生产者1");
            Consumer c1 = new Consumer(clerk);
            c1.setName("消费者1");
            p1.start();
            c1.start();
        }
    }
}

```