java实现生产者消费者问题，求大神看看哪里的问题

[wjw19940424]

package entity;
public class Apple {
	public Integer num = 0;
	public void addApple() {
		synchronized (num) {
			while (num == 5) {
				try {
					num.wait();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			num++;
			System.out.println(Thread.currentThread().getName() + "添加苹果" + " "
					+ "苹果数量" + num);
			num.notifyAll();
		}
	}
	public void getApple() {
		synchronized (num) {
			while (num == 0) {
				try {
					num.wait();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			num--;
			System.out.println(Thread.currentThread().getName() + "取走苹果" + " "
					+ "苹果数量" + num);
			num.notifyAll();
		}
	}

}

package xiancheng;

import entity.Apple;

public class Add implements Runnable {
	
	public Apple apple;
	
	public Add(){}
	
	public Add(Apple apple){
		this.apple=apple;
	}
	
	

	@Override
	public void run() {
		// TODO Auto-generated method stub
		
			apple.addApple();
			
		
	}

}

package xiancheng;

import entity.Apple;

public class Min implements Runnable {
	
	public Apple apple;
	
	public Min(){}
	
	public Min(Apple apple){
		this.apple=apple;
	}

	@Override
	public void run() {
		// TODO Auto-generated method stub

		
			apple.getApple();
			
	}

}

package xiancheng;

import entity.Apple;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Apple apple = new Apple();
		Add add = new Add(apple);
		Min min = new Min(apple);

		new Thread(add).start();
		new Thread(add).start();
		new Thread(add).start();
		new Thread(add).start();
		new Thread(add).start();
		new Thread(min).start();
		new Thread(min).start();
		new Thread(min).start();
		new Thread(min).start();
		new Thread(min).start();

	}

}

[Chengyajie521]

下面是源码中对notify的解释，认真看一下，notify中的对象必须是这个线程的监视者，成为监视者可以有3中方法，下面有详细 * This method should only be called by a thread that is the owner * of this object's monitor. A thread becomes the owner of the * object's monitor in one of three ways: * 1.By executing a synchronized instance method of that object. * 2.By executing the body of a {@code synchronized} statement * that synchronizes on the object. * 3.For objects of type {@code Class,} by executing a * synchronized static method of that class. 明显这个线程的监视对象是num,但是 Integer++以后变成了新的对象，比如说你再synchronize块中锁的是num对象，然后你把num++了，他变成了另一个对象（新的地址）,所以他已经不是这个线程的监视者了

[oh_Maxy]

2L说的对，1L的方法会产生死锁。 可以改进下，自定义一个MyInteger类，里面只有一个int num=0, public Integer num = 0; 改成 public MyInteger myNum = 0; 对num的锁定操作改成对myNum的锁定，这样试试吧

[姜小白-]

将num.wait() 修改为
this.wait();//让当前线程等待