主要并发工具类-Exchanger的使用

Exchanger 从字面来看是一个交换器，它用来在线程间交换数据。
到exchange方法处时会阻塞，传递给对方数据，并等待对方数据的到来。

 Exchanger<String> exchanger = new Exchanger<>();
        new Thread(() -> {
            System.out.println("Thread A do something...");
            try {
                String result = exchanger.exchange("string from A");
                System.out.println("Thread A get " + result);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();
        new Thread(() -> {
            System.out.println("Thread B do something...");
            try {
                String result = exchanger.exchange("string from B");
                System.out.println("Thread B get " + result);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();

结果：

Thread A do something...
Thread B do something...
Thread A get string from B
Thread B get string from A