一個java用future的例項...

 詳細的不說了..看看程式碼吧

public static void main(String[] args) throws InterruptedException, ExecutionException {
        System.out.println("====勇者悄悄進入了宮殿");

        //通過執行緒池管理多執行緒
        ExecutorService threadPool = Executors.newCachedThreadPool();

        //執行緒池提交一個非同步任務
        System.out.println("====勇者安放了一個炸彈,並設定10分鐘後爆炸");
        Future<HashMap<String,String>> future = threadPool.submit(new Callable<HashMap<String,String>>() {
            public HashMap<String,String> call() throws Exception {

                System.out.println("炸彈開始倒計時....");
                Thread.sleep(10000);
                System.out.println("炸彈啟動...滴滴滴滴滴!!!!");

                return new HashMap<String,String>(){
                    {this.put("futureKey", "Boom~炸彈爆炸了");}
                };
            }
        });

        System.out.println("====勇者放完炸彈後騎著自己的小馬飛快的回到了家");
        boolean flag = true;
        while(flag){
            Thread.sleep(1000);
            if(future.isDone() && !future.isCancelled()){
                HashMap<String,String> futureResult = future.get();
                System.out.println("====遠方傳來了好訊息,結果是："+futureResult.get("futureKey"));
                flag = false;
            }else{
                System.out.println("====勇者還在家靜靜的喝茶,等待著好訊息的到來");
            }
        }

        //關閉執行緒池
        if(!threadPool.isShutdown()){
            threadPool.shutdown();
        }
    }