Condition实现一个生产者一个消费者

Condition实现一个生产者一个消费者，实现一对一交替打印：

　　

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

/**
 *    生产消费逻辑
 */
public class MyService {
    
    private ReentrantLock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();
    private boolean hasValue = false;
    
    public void set() {
        try {
            lock.lock();
            while (hasValue) {
                condition.await();
            }
            System.out.println("☆");
            hasValue = true;
            condition.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    
    public void get() {
        try {
            lock.lock();
            while(!hasValue) {
                condition.await();
            }
            System.out.println("★");
            hasValue = false;
            condition.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
}

/**
 *    生产者线程
 */
public class MyThreadA extends Thread{
    private MyService service;
    
    public MyThreadA(MyService service) {
        this.service = service;
    }
    
    @Override
    public void run() {
        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            service.set();
        }
    }
}

/**
 *    消费者线程
 */
public class MyThreadB extends Thread{
    private MyService service;
    
    public MyThreadB(MyService service) {
        this.service = service;
    }
    
    @Override
    public void run() {
        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            service.get();
        }
    }
}

/**
 *    交替打印测试类
 */
public class Run {

    public static void main(String[] args) {
        MyService service = new MyService();
        
        MyThreadA a = new MyThreadA(service);
        a.start();
        MyThreadB b = new MyThreadB(service);
        b.start();
    }
}

运行结果如下：