Callable 和Future 接口使用

使用Callable和Future的组合，异步获取数据,Callable负责执行，Future获取执行结果

1：Callable和Future 

ExecutorService executor = Executors.newCachedThreadPool();Future future=executor.submit(new Callable(){    @Override    public Object call() throws Exception {        return null;    }});System.out.print(future.get());