原因：wait会释放synchronized锁，多个consume线程或者produce线程wait之后，会不进行检查foodNum 直接变化。。。。。。。所以应该用while (foodNum == MAX_NUM){ System.out.println("box is full，size = " + foodNum); synObj.wait(); } while (foodNum == 0){ System.out.println("box is empty,size = " + foodNum); synObj.wait(); }---------------------------------------分割线-----------------------------------------其实生产者消费者问题的解决方法有很多，这里列举三种1）使用Java的wait() / notify()机制2）使用Java的信号量await() / signal()方法机制3）使用 2）使用Java的信号量await() / signal()方法机制import java.io.IOException;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.ReentrantLock;/** * @author 作者 E-mail: * @version 创建时间：2015-10-23 下午04:08:39 类说明 */public class AwaitAndSignal{ public static void main(String args) throws IOException { Person person = new Person(); new Thread(new Consumer(person), "消费者一").start(); new Thread(new Consumer(person), "消费者二").start(); new Thread(new Consumer(person), "消费者三").start(); new Thread(new Producer(person), "生产者一").start(); new Thread(new Producer(person), "生产者一").start(); new Thread(new Producer(person), "生产者一").start(); }}class Producer implements Runnable{ private Person person; public Producer(Person person) { this.person = person; } @Override public void run() { for (int i = 0; i \u0026lt; 10; i++) { person.produce(); } }}class Consumer implements Runnable{ private Person person; public Consumer(Person person) { this.person = person; } @Override public void run() { for (int i = 0; i \u0026lt; 10; i++) { person.consume(); } }}class Person{ private int foodNum = 0; private ReentrantLock lock = new ReentrantLock(); private Condition condition = lock.newCondition(); private final int MAX_NUM = 5; public void produce() { lock.lock(); try { while (foodNum == MAX_NUM) { System.out.println("box is full，size = " + foodNum); condition.await(); } foodNum++; System.out.println("produce success foodNum = " + foodNum); condition.signalAll(); } catch(InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } } public void consume() { lock.lock(); try { while (foodNum == 0) { System.out.println("box is empty,size = " + foodNum); condition.await(); } foodNum--; System.out.println("consume success foodNum = " + foodNum); condition.signalAll(); } catch(InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } }}