生产者消费者实例

来源：互联网发布：壁虎java视频百度网盘编辑：程序博客网时间：2024/06/18 11:31
生产者消费者实例

代码参考了： http://blog.csdn.net/monkey_d_meng/article/details/6251879/
并在此基础上做了改动
用wait()、notify()、notifyAll()方法写（在代码中被注释了）。
用Lock、ReentrantLock、await()、signalAll()写
类图如下：
这里写图片描述
代码如下：
import java.util.LinkedList;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;import java.util.concurrent.locks.Condition;abstract class People { // 增加了一个抽象类    int num = 0;    public void produce(int num){}    public void consume(int num){}    public void setNum(int num) {        this.num = num;    }    public int getNum() {        return num;    }}class Producer extends People implements Runnable {    private Storage storage;    public Producer(Storage storage) {          this.storage = storage;      }      @Override    public void produce(int num) {        storage.produce(num);    }    @Override    public void run() {        produce(num);    }}class Consumer extends People implements Runnable { // 改用Runnable接口    private Storage storage;    public Consumer(Storage storage) {          this.storage = storage;      }     @Override    public void consume(int num) {        storage.consume(num);    }    @Override    public void run() {        consume(num);    }}public class Storage {    private final int MAX_SIZE = 100; // 仓库的最大存储量    private LinkedList<Object> list = new LinkedList();    private final Lock lock = new ReentrantLock();    private final Condition full = lock.newCondition();    private final Condition empty = lock.newCondition();    public void produce(int num) { // 生产num个产品//      synchronized(list) { // 同步代码块        lock.lock();            while(list.size() + num > MAX_SIZE) { // 如果仓库剩余容量不足                System.out.println("【要生产的产品数量】：" + num + " 【库存量】："                          + list.size() + "  暂时不能执行生产任务");                try{//                  list.wait();                    full.await();                }catch(InterruptedException e) {                    e.printStackTrace();                }            }            for(int i = 0; i < num; i++) {                list.add(new Object());            }            System.out.println("【已经生产产品数】：" + num + " 【现仓储量为】:" + list.size());//          list.notifyAll();        full.signalAll();        empty.signalAll();        lock.unlock();//      }    }    public void consume(int num) { // 消费num个产品//      synchronized(list) {        lock.lock();            while(list.size() < num) {                System.out.println("【要消费的产品数量】:" + num + " 【库存量】:"                          + list.size() + " 暂时不能执行消费任务!");                try {//                  list.wait();                    empty.await();                }catch(InterruptedException e) {                    e.printStackTrace();                }            }            for(int i = 0; i < num; i++) {                list.remove();            }            System.out.println("【已经消费产品数】:" + num + " 【现仓储量为】:" + list.size());//          list.notifyAll();        full.signalAll();        empty.signalAll();        lock.unlock();//      }    }    public static void main(String[] args) {        // TODO Auto-generated method stub        // 仓库对象          Storage storage = new Storage();          // 生产者对象          Producer p1 = new Producer(storage);          Producer p2 = new Producer(storage);          Producer p3 = new Producer(storage);          Producer p4 = new Producer(storage);          Producer p5 = new Producer(storage);          Producer p6 = new Producer(storage);          Producer p7 = new Producer(storage);          // 消费者对象          Consumer c1 = new Consumer(storage);          Consumer c2 = new Consumer(storage);          Consumer c3 = new Consumer(storage);          // 设置生产者产品生产数量          p1.setNum(60);          p2.setNum(70);          p3.setNum(80);          p4.setNum(10);          p5.setNum(10);          p6.setNum(10);          p7.setNum(80);          // 设置消费者产品消费数量          c1.setNum(50);          c2.setNum(20);          c3.setNum(30);          // 线程开始执行          new Thread(c1, "c1").start();        new Thread(c2, "c2").start();        new Thread(c3, "c3").start();        new Thread(p1, "p1").start();        new Thread(p2, "p2").start();        new Thread(p3, "p3").start();        new Thread(p4, "p4").start();        new Thread(p5, "p5").start();        new Thread(p6, "p6").start();        new Thread(p7, "p7").start();    }}
阅读全文
0 0