Callables and Futures
2010-07-30 16:44
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和Runnalbe一样,Callable也代表一个计算任务。但是它更强大的一点在于它可以把计算的结果做为返回值返回。而Future正是表示一个异步执行的计算任务的结果,这个类之所以叫做Future大概是因为在这个对象创建之初,结果并没有真正得到(因为计算是在异步执行的),它只是代表了一个“未来”会出现的对象。所某种意义上说,它其时就是一个代理。而当调用它的get方法时才是真正获取值的时候,这个get方法在执行期间很有可能会被阻塞,因为它要等待Callable任务结束之后才能得到反回值!与此同时,你还可以通过它的isDone等方法来时时地查询任务的执行状态。可以说Callables和Futures一对组合,而将这两者结合在一起的就是ExecutorService,它的<T> Future<T> submit(Callable<T> task)方法正是启动一个Callbale任务并返回它的执行结果!
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