JUC并发包Exchanger包的礼物交换Demo

package com.tkp.lock;

import java.util.concurrent.Exchanger;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * Exchanger<V> 类，交换器
 * 1.java.util.concurrent.Exchanger
 *
 * 2.构造方法
 *  public Exchanger()
 * 3.常用API方法
 *  public V exchange(V x) throws InterruptedException  交换方法
 *  public V exchange(V x, long timeout, TimeUnit unit)throws InterruptedException, TimeoutException
 *  指定延时时间，一旦超时则抛出TimeoutException异常，且不会交换数据
 *
 * 4.特点
 * Exchanger（交换器）是一个用于线程间协作的工具类。Exchanger用于进行线程间的数据交换
 * 传递形式参数与泛型一致；形参：互换的数据
 * 返回值与泛型一致；返回值：交换后收到 的数据
 */
public class ExchangerDemo {
    public static void main(String[] args) {
        Exchanger<String> exchanger = new Exchanger<>();
        new Thread(new BoyThread(exchanger), "张三丰").start();
        new Thread(new GirlThread(exchanger), "李小花").start();
    }
}

class BoyThread implements Runnable{
    private Exchanger<String> exchanger;

    public BoyThread(Exchanger<String> exchanger) {
        this.exchanger = exchanger;
    }

    //互换礼物
    @Override
    public void run() {
        try {
            TimeUnit.SECONDS.sleep(5);
            String str = exchanger.exchange("礼物A");
            System.out.println(Thread.currentThread().getName() +"收到："+str);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

class GirlThread implements Runnable{
    Exchanger<String> exchanger;

    public GirlThread(Exchanger<String> exchanger) {
        this.exchanger = exchanger;
    }

    //互换礼物
    @Override
    public void run() {
        try {
            String str = exchanger.exchange("礼物B");//一直等待交换
//            String str = exchanger.exchange("礼物B", 1, TimeUnit.SECONDS);  //指定等待时间，超时就抛异常，且终止交换
            System.out.println(Thread.currentThread().getName() + "收到："+str);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } /*catch (TimeoutException e) {
//            e.printStackTrace();
            System.out.println("没有收到礼物，不开心！");
        }*/
    }

}