Exchanger用於執行緒間進行通訊、資料交換。Exchanger提供了一個同步點exchange方法，兩個執行緒呼叫exchange方法時，無論呼叫時間先後，兩個執行緒會互相等到執行緒到達exchange方法呼叫點，此時兩個執行緒可以交換資料，將本執行緒產出資料傳遞給對方。

程式碼示例：

 1 package com.zte.paas.lcap.application.web;
 2 
 3 import java.util.concurrent.Exchanger;
 4 import java.util.stream.Stream;
 5 
 6 /**
 7  * @Description: TODO
 
 8  * @Author LG
 9  * @Date 2022/3/15
10  */
11 public class MoneyExchanger implements Runnable{
12     //資料交換器
13     Exchanger<String> exchanger = null;
14     //交換資料的陣列物件
15     String[] moneys = null;
16 
17     public MoneyExchanger(Exchanger<String> exchanger, String[] moneys) {
18         this
 
.exchanger = exchanger;
19         this.moneys = moneys;
20     }
21 
22     @Override
23     public void run() {
24         Stream.of(moneys).forEach(money -> {
25             try {
26                 //用money換取exMoney
27                 String exMoney = this.exchanger.exchange(money);
28                 System.out.println(Thread.currentThread().getName() + " 用 " + money + " 換 " + exMoney);
 
29             } catch (InterruptedException e) {
30                 e.printStackTrace();
31             }
32         });
33     }
34 
35     public static void main(String[] args) {
36         Exchanger<String> exchanger = new Exchanger<>();
37         MoneyExchanger moneyExchanger = new MoneyExchanger(exchanger,new String[]{"人民幣","盧布"});
38         MoneyExchanger moneyExchanger2 = new MoneyExchanger(exchanger, new String[]{"美元","日元"});
39         new Thread(moneyExchanger).start();
40         new Thread(moneyExchanger2).start();
41 
42     }
43 }

執行結果：