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创建步骤，首先实现Callable接口的call()方法并指定返回值；然后创建实现类实例；FutureTask类使用Callable实现类的实例通过FutureTask的单参数构造器创建FutureTask的实例；通过Thread类的构造器创建Thread类实例，并执行start方法，启动线程；最后通过FutureTask实例的get()方法阻塞拿到Callable实现类的call方法的返回值。

示例如下，

public class CallableTest implements Callable {

@Override

public String call() throws Exception {

for (int i = 0; i < 5 ; i++) {

Thread.sleep(Math.round(Math.random()*1000)); //线程随机时长休眠

System.out.println(Thread.currentThread().getName()+" "+i);

}

return Thread.currentThread().getName()+" is completed."; // 返回值

}

public static void main(String[] args) throws ExecutionException, InterruptedException {

CallableTest callableTest1 = new CallableTest();

CallableTest callableTest2 = new CallableTest();

FutureTaskfutureTask1 = new FutureTask(callableTest1);

FutureTaskfutureTask2 = new FutureTask(callableTest2);

new Thread(futureTask1,"Thread-1: ").start();

new Thread(futureTask2,"Thread-2: ").start();

System.out.println(futureTask1.get());

System.out.println(futureTask2.get());

}

}

执行结果，

Thread-2:  0

Thread-2:  1

Thread-1:  0

Thread-2:  2

Thread-1:  1

Thread-2:  3

Thread-2:  4

Thread-1:  2

Thread-1:  3

Thread-1:  4

Thread-1:  is completed.

Thread-2:  is completed.