比如生活中两个人,一个人有零食,另一个人有钱,他们两个想等价交换,对好口号在某个地方相见,一个人先到了之后,必须等另一个人带着需要的东西来了之后,才能开始hi交换。
代码:
import java.util.concurrent.Exchanger; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class ExchangeTest { public static void main(String[] args) { ExecutorService service =Executors.newCachedThreadPool(); final Exchanger exchanger = new Exchanger(); service.execute(new Runnable() { @Override public void run() { try{ String data1 = "零食"; System.out.println("线程"+Thread.currentThread().getName()+ "正在把数据 "+data1+" 换出去"); Thread.sleep((long)Math.random()*10000); String data2 = (String)exchanger.exchange(data1); System.out.println("线程 "+Thread.currentThread().getName()+ "换回的数据为 "+data2); }catch(Exception e){ e.printStackTrace(); } } }); service.execute(new Runnable() { @Override public void run() { try{ String data1 = "钱"; System.out.println("线程"+Thread.currentThread().getName()+ "正在把数据 "+data1+" 交换出去"); Thread.sleep((long)(Math.random()*10000)); String data2 =(String)exchanger.exchange(data1); System.out.println("线程 "+Thread.currentThread().getName()+ "交换回来的数据是: "+data2); }catch(Exception e){ e.printStackTrace(); } } }); } }
控制台输出:
线程pool-1-thread-1正在把数据 零食 换出去
线程pool-1-thread-2正在把数据 钱 交换出去
线程 pool-1-thread-1换回的数据为 钱
线程 pool-1-thread-2交换回来的数据是: 零食