java線程數據交換Exchanger

兩個線程都等到交換函數才能完成交換數據操做，代碼以下：

package threadLock;

import java.util.Random;
import java.util.concurrent.Exchanger;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ExchangerTest {

    public static void main(String[] args) {
        final Exchanger<String> ex = new Exchanger<String>();
        ExecutorService service = Executors.newCachedThreadPool();
        service.execute(new  Runnable() {
            public void run() {
                String data1 = "5555";
                System.out.println("線程" + Thread.currentThread().getName() + "正在把" + "\"" + data1 + "\"交換出去" );
                try {
                    Thread.sleep(new Random().nextInt(1000));
                    String data2 = ex.exchange(data1);
                    System.out.println("線程" + Thread.currentThread().getName() + "交換後的數據爲\"" + data2 + "\"");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        service.execute(new Runnable() {
            
            @Override
            public void run() {
                String data1 = "gghhh";
                System.out.println("線程" + Thread.currentThread().getName() + "正在把" + "\"" + data1 + "\"交換出去" );
                try {
                    Thread.sleep(new Random().nextInt(1000));
                    String data2 = ex.exchange(data1);
                    System.out.println("線程" + Thread.currentThread().getName() + "交換後的數據爲\"" + data2 + "\"");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        
        service.shutdown();
    }
}