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                ![](https://cdn.zimug.com/wx-zimug.png) `java.util.concurrent.Exchanger`可以用來進行數據交換,或者被稱為“數據交換器”。兩個線程可以使用Exchanger交換數據,下圖用來說明Exchanger的作用 ![](http://cdn.zimug.com/7cef0cda9058f2aaff4e1f16a761cbbc) 在下面的代碼中 * 首先我們定義了一個Exchanger,用于數據交換 * 然后定義了兩個線程對象bookExchanger1和bookExchanger2,兩個線程都持有Exchanger交換器對象用于數據交換 * 兩個線程中的每個線程都有自己的數據,比如下面代碼中的String[] 書籍數組。 ~~~ public static void main(String[] args) { //數據交換器-數據為book Exchanger<String> exchanger = new Exchanger<>(); //換書線程1 BookExchanger bookExchanger1 = new BookExchanger(exchanger, new String[]{"Java從入門到放棄","Java編程思想"}); //換書線程2 BookExchanger bookExchanger2 = new BookExchanger(exchanger, new String[]{"C語言程序設計","實戰Python數據分析"}); new Thread(bookExchanger1).start(); new Thread(bookExchanger2).start(); } ~~~ BookExchanger 繼承自Runnable代表參與換書的換書讀者,他持有Exchanger數據交換器用于交換圖書。 ~~~ public class BookExchanger implements Runnable{ Exchanger<String> exchanger = null; //數據交換器 String[] books = null; //圖書數組 public BookExchanger(Exchanger<String> exchanger, String[] books) { this.exchanger = exchanger; this.books = books; } @Override public void run() { try { for(String bookName : books) { //交換數據,bookName為我的書,exBook為我換回來的書 String exBook = this.exchanger.exchange(bookName); System.out.println( Thread.currentThread().getName() + " 用《 " + bookName + "》 換 《 " + exBook + "》" ); } } catch (InterruptedException e) { e.printStackTrace(); } } } ~~~ 執行上文中的代碼,得到如下的打印輸出。可以看到只有兩個線程完成一次交換之后,才能再進行下一次的交換。 ~~~ Thread-1 用《 C語言程序設計》 換 《 Java從入門到放棄》 Thread-0 用《 Java從入門到放棄》 換 《 C語言程序設計》 Thread-1 用《 實戰Python數據分析》 換 《 Java編程思想》 Thread-0 用《 Java編程思想》 換 《 實戰Python數據分析》 ~~~
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