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Future<V> |

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# 异步执行结果的接口

# 方法

boolean cancel(boolean mayInterruptIfRunning);

* 取消执行

* mayInterruptIfRunning 设置是否要抛出线程中断异常

boolean isCancelled();

* 是否取消执行

boolean isDone();

* 是否执行完毕

V get() throws InterruptedException, ExecutionException;

* 获取到执行的结果,会阻塞当前的线程

V get(long timeout, TimeUnit unit)throws InterruptedException, ExecutionException, TimeoutException;

* 获取到执行的结果,会阻塞当前的线程

* 可以设置一个超时时间,超时后抛出 TimeoutException