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futureTask - 未来任务, 封装次线程，给主线程以后调用（异步）。常见方法：isDone(), get()

调用方式：

new Thread(futureTask/runnable).start()

new ThreadPoolExecutor.execute(futureTask/callable/runnable))

Future x = Executors.newFixedThreadPool(3).submit(futureTask/callable/runnable)

例子：

public class Thread08_futureTask {	public static void main(String[] args) {		mainTask();	}		public static void mainTask() {		Long cnt = 3l;		try {			System.out.println("count1:" + cnt);			new Thread(futureTask).start();			while (!futureTask.isDone()) {		// isDone()			}			System.out.println("count2:" + (cnt + futureTask.get()));		// get()		} catch (Exception e) {			e.printStackTrace();		}	}	static FutureTask
   
     futureTask = new FutureTask
    
     (new Callable
     
      () {		public Long call() {			try {				int sleepTime = new Random().nextInt(2000);				System.out.println("sleep " + sleepTime / 1000.0 + " seconds");				Thread.sleep(sleepTime);			} catch (InterruptedException e) {				e.printStackTrace();			}			return Long.valueOf(2);		}	});}
     
    
   

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