@Test
    public void test04(){
        Exchanger<String> exchanger = new Exchanger<>(); //new出交換機
        new Thread(new Spy01(exchanger)).start(); //從構造方法傳入物件中
        new Thread(new Spy02(exchanger)).start();
    }

class Spy01 implements Runnable{

    Exchanger<String> exchanger;

    public Spy01(Exchanger<String> exchanger) {
        this.exchanger = exchanger;  //從構造方法傳入交換機
    }

    @Override
    public void run() {
        String str01 = "天蒼蒼";  //暗號，也就是要傳給另一方的資料
        try {
            String spy02 = exchanger.exchange(str01);  
                            //該方法將自己的資料傳給對方，同時接收的是對方傳來的資料
            System.out.println("spy02說："+spy02);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
}
class Spy02 implements Runnable{

    Exchanger<String> exchanger;
    public Spy02(Exchanger<String> exchanger) {
        this.exchanger = exchanger;
    }

    @Override
    public void run() {
        String str02 = "野茫茫";
        try {
            String spy01 = exchanger.exchange(str02);
            System.out.println("spy01說：" + spy01);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
 

spy02說：野茫茫
spy01說：天蒼蒼