JUC版的生产者消费者

JUC版的生产者消费者

使用Lock对象进行上锁

使用Condition对象进行等待唤醒

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class JUCDemo {
    public static void main(String[] args) {
        // 实例化资源类
        Data data = new Data();

        // 生产者
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                data.increment();
            }
        }, "生产者").start();

        // 消费者
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                data.decrement();
            }
        }, "消费者").start();

    }
}

// 资源类
class Data {
    // 资源
    private int num = 0;
    // Lock锁实例化
    Lock lock = new ReentrantLock();
    // 拿到condition
    Condition condition = lock.newCondition();

    public void increment() {
        // 上锁
        lock.lock();
        try {
            // 等待
            while (num != 0) {
                try {
                    condition.await();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            // 业务操作
            num++;
            System.out.println(Thread.currentThread().getName() + "===>" + num);
            // 通知
            condition.signalAll();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 解锁
            lock.unlock();
        }
    }

    public void decrement() {
        // 上锁
        lock.lock();
        try {
            // 等待
            while (num == 0) {
                try {
                    condition.await();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            // 业务操作
            num--;
            System.out.println(Thread.currentThread().getName() + "===>" + num);
            // 通知
            condition.signalAll();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 解锁
            lock.unlock();
        }
    }
}