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                ### FutureTask FutureTask也可以用作閉鎖; FutureTask實現了Future語義,表示一種抽象的可生成結果的計算;Future表示的計算是通過Callable來實現,相當于一種可生成結果的Runnable,并且可處于以下三種狀態:等待運行,正在運行\(Running\)和運行完成\(Completed\); FutureTask.get的行為取決于任務的狀態;如果任務已經完成,那么get會立即返回結果,否則將阻塞直到任務進入完成狀態,然后返回結果或拋出異常; FutureTask將計算結果從執行計算的線程傳遞到獲取這個結果的線程,而FutureTask的規范確保了這種傳遞過程能實現結果的安全發布; 示例: ``` public class Appliction { public static void main(String[] args) throws InterruptedException, ExecutionException, TimeoutException { FutureTask futureTask = new FutureTask(()->{ Result result = new Result(); TimeUnit.SECONDS.sleep(10); result.setCount(10); return result; }); Thread thread = new Thread(futureTask); thread.start(); Result result = (Result) futureTask.get(3,TimeUnit.SECONDS); System.err.println(result.getCount()); } } class Result{ private int count; public int getCount() { return count; } public void setCount(int count) { this.count = count; } } ```
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