Java多線程生產者消費者模型

 

用多線程實現一個生產者消費者模型，滿足如下條件：

1. 先生產後消費，不生產不消費

2. 要求最多生產5個產品，超過5個則不能繼續生產，低於0個則不能消費

3. 採用多線程實現

 

相關Java程序如下。

 

package cn.edu.lcudcc;

import java.util.LinkedList;
import java.util.Queue;

public class ProducerConsumer {
    private static final int MAX_SIZE = 5;
    private final Queue<Integer> queue = new LinkedList<>();

    class Producer extends Thread {
        @Override
        public void run() {
            int value = 0;
            while (true) {
                synchronized (queue) {
                    while (queue.size() >= MAX_SIZE) {
                        try {
                            System.out.println("隊列滿，生產者 " + Thread.currentThread().getName() + " 等待");
                            queue.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    System.out.println("生產者 " + Thread.currentThread().getName() + " 生產了產品：" + value);
                    queue.offer(value++);
                    queue.notifyAll();
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

    class Consumer extends Thread {
        @Override
        public void run() {
            while (true) {
                synchronized (queue) {
                    while (queue.isEmpty()) {
                        try {
                            System.out.println("隊列空，消費者 " + Thread.currentThread().getName() + " 等待");
                            queue.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    int value = queue.poll();
                    System.out.println("消費者 " + Thread.currentThread().getName() + " 消費了產品：" + value);
                    queue.notifyAll();
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

    public static void main(String[] args) {
        ProducerConsumer pc = new ProducerConsumer();
        pc.new Producer().start();
        pc.new Consumer().start();
    }
}