java 生产者与消费者问题

package concurrency;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Storage {
    private int capacity;
    private int size;
    
    public Storage(int capacity){
        this.capacity=capacity;
        size=0;
    }
    
    public synchronized void produce(){
        while(size>=capacity){
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
            
        size++;
        System.out.println(Thread.currentThread().getName()+" produced one item, current storage:"+size);
        notifyAll();
    }
    
    public synchronized void consume(){
        while(size<=0){
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        size--;
        System.out.println(Thread.currentThread().getName()+" consumed one item, current storage:"+size);
        notifyAll();            
    }
    
    
    
    public static void main(String [] args){
        Storage storage = new Storage(10);
        startProductThread(storage);
        startConsumThread(storage);
    }
    
    /**
     * 开启生产者线程
     */
    public static void startProductThread(Storage storage){
        System.out.println("--生产者线程执行开始--");
        int pThreadSize = 10;
        ExecutorService pool = Executors.newFixedThreadPool(pThreadSize);
        for(int i=0;i<pThreadSize;i++){
            Producer productThread = new Producer(storage);
            Thread thread = new Thread(productThread);
            pool.execute(thread);
        }
        System.out.println("--生产者线程执行结束--");
    }
    
    /**
     * 开启消费者线程
     */
    public static void startConsumThread(Storage storage){
        System.out.println("--消费者线程执行开始--");
        int pThreadSize = 10;
        ExecutorService pool = Executors.newFixedThreadPool(pThreadSize);
        for(int i=0;i<pThreadSize;i++){
            Consumer consumeThread = new Consumer(storage);
            Thread thread = new Thread(consumeThread);
            pool.execute(thread);
        }
        System.out.println("--消费者线程执行结束--");
    }

}

class Producer implements Runnable {
    Storage storage;
    
    public Producer(Storage storage){
        this.storage=storage;
    }
    
    @Override
    public void run(){
        while(true){
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            storage.produce();
        }
    }
}

class Consumer implements Runnable{
    Storage storage;
    
    public Consumer(Storage storage){
        this.storage=storage;
    }

    @Override
    public void run() {
        while(true){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            storage.consume();
        }
        
    }
}