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import java.util.concurrent.Callable;import java.util.concurrent.ExecutionException;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.Future;import java.util.concurrent.FutureTask;public class Test2 {	public void Test2()	{		ExecutorService threadpool = Executors.newCachedThreadPool();		FutureTask
   
     fTask = new FutureTask
    
     (new testTask());		threadpool.execute(fTask);				try {			System.out.println("result = "+fTask.get());		} catch (InterruptedException | ExecutionException e) {			// TODO Auto-generated catch block			e.printStackTrace();		}				/*		FutureStask 是Future
     
      的实现类，同时也是Runnable的实现类，因此它可以被提交给Executor执行，作为一个线程运行，并在此线程中		处理关联的线程的返回值。		You would only need to use FutureTask if you want to change its behavior or access its Callable later. For 99% of uses, just use Callable and Future.		FutureTask提供了一种异步方式获取来获取某个Callable线程的执行结果，stackoverflow的讨论帖认为，两者仅有API上的区别，实际使用中，		FutureTask并没有太大的优势。		*/				threadpool.shutdown();	}		public class testTask implements Callable
      
       	{		@Override		public Long call() throws Exception {			// TODO Auto-generated method stub			int i = 1;			long result = 0;						for( ;i < 500000; i++ )  //计算一个累加值并返回			{				result += i;			}						return result;		}			}}
      
     
    
   

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