java并发数据包Exchanger线程间的数据交换器

public static void main(String[] args) {
  //数据交换器-数据为book
  Exchanger<String> exchanger = new Exchanger<>();
  //换书线程1
  BookExchanger bookExchanger1
          = new BookExchanger(exchanger, new String[]{"Java从入门到放弃","Java编程思想"});
  //换书线程2
  BookExchanger bookExchanger2
          = new BookExchanger(exchanger, new String[]{"C语言程序设计","实战Python数据分析"});
  new Thread(bookExchanger1).start();
  new Thread(bookExchanger2).start();
}

public class BookExchanger implements Runnable{
    Exchanger<String> exchanger = null;  //数据交换器
    String[]  books    = null;   //图书数组
    public BookExchanger(Exchanger<String> exchanger, String[] books) {
        this.exchanger = exchanger;
        this.books = books;
    }
    @Override
    public void run() {
        try {
            for(String bookName : books) {
                //交换数据，bookName为我的书，exBook为我换回来的书
                String exBook = this.exchanger.exchange(bookName);
                System.out.println(
                        Thread.currentThread().getName() +
                                " 用《 " + bookName + "》 换 《 " + exBook + "》"
                );
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}