多线程之Exchager(线程数据阻塞点交换)应用

/**
 * @author: 47Gamer
 * @Date: 2021/6/2 15:24
 * @Description:
 * 假设定个外卖，外卖小哥约定取餐地点，我们拿着钱去换订的餐
 *  Exchager:  两个线程，在同一点（阻塞点），交换数据
 */
public class ExchagerDemo {
 
    public static void main(String[] args) {
        final Exchanger<String> exchanger = new Exchanger<>();
        Executorservice executor = Executors.newCachedThreadPool();
        executor.submit(()->{
            final String message = exchanger.exchange("肯德基");
            System.out.println("快递员拿着肯德基交换了"+message+"钱");
            return null;
        });
        executor.submit(()->{
            final String message = exchanger.exchange("30元");
            System.out.println("我们拿了30元换回"+messagE);
            return null;
        });
        executor.shutdown();
    }
}