public class Demo {
    public static void main(String[] args) {
        Exchanger<String> stringExchanger = new Exchanger<>();

        Thread studentA = new Thread(() -> {
            try {
                String dataA = "A同學(xué)收藏多年的大片";
                String dataB = stringExchanger.exchange(dataA);
                System.out.println("A同學(xué)得到了" + dataB);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });

        Thread studentB = new Thread(() -> {
            try {
                String dataB = "B同學(xué)收藏多年的大片";
                String dataA = stringExchanger.exchange(dataB);
                System.out.println("B同學(xué)得到了" + dataA);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });

        studentA.start();
        studentB.start();
    }
}

/*
 * 輸出結(jié)果：
 * B同學(xué)得到了A同學(xué)收藏多年的大片
 * A同學(xué)得到了B同學(xué)收藏多年的大片
 */

public class Demo {
    public static void main(String[] args) {
        Exchanger<String> stringExchanger = new Exchanger<>();

        Thread studentA = new Thread(() -> {
            String dataB = null;
            try {
                String dataA = "A同學(xué)收藏多年的大片";
                //最多等待5秒
                dataB = stringExchanger.exchange(dataA, 5, TimeUnit.SECONDS);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (TimeoutException ex){
                System.out.println("等待超時(shí)-TimeoutException");
            }

            System.out.println("A同學(xué)得到了" + dataB);
        });

        studentA.start();
    }
}

/*
 * 輸出結(jié)果：
 * 等待超時(shí)-TimeoutException
 * A同學(xué)得到了null
 */