Java编程线程同步工具Exchanger的使用实例解析

public class ExchangerTest {
	public static void main(String[] args) {
		ExecutorService service = Executors.newCachedThreadPool();
		final Exchanger exchanger = new Exchanger();
		//定义一个交换对象，用来交换数据
		//开启一个线程执行任务
		service.execute(new Runnable(){
			@Override
			      public void run() {
				try {
					String data1 = "海洛因";
					System.out.println("线程" + Thread.currentThread().getName() 
					              + "正在把毒品" + data1 + "拿出来");
					Thread.sleep((long)(Math.random()*10000));
					//把要交换的数据传到exchange方法中，然后被阻塞，等待另一个线程与之交换。返回交换后的数据
					String data2 = (String)exchanger.exchange(data1);
					System.out.println("线程" + Thread.currentThread().getName() + 
					          "用海洛因换来了" + data2);
				}
				catch(Exception e){
				}
				finally {
					service.shutdown();
					System.out.println("交易完毕，拿着钱快跑！");
				}
			}
		}
		);
		//开启另一个线程执行任务
		service.execute(new Runnable(){
			@Override
			      public void run() {
				try {
					String data1 = "300万";
					System.out.println("线程" + Thread.currentThread().getName() + 
					          "正在把" + data1 +"拿出来");
					Thread.sleep((long)(Math.random()*10000));
					String data2 = (String)exchanger.exchange(data1);
					System.out.println("线程" + Thread.currentThread().getName() + 
					          "用300万弄到了" + data2);
				}
				catch(Exception e){
				}
				finally {
					service.shutdown();
					System.out.println("交易完毕，拿着海洛因快跑！");
				}
			}
		}
		);
	}
}