概念

简单使用

在java的源码里 使用callable需要使用FutureTask做为适配器

public class CallableTest {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        MyThread myThread=new MyThread();
        FutureTask futureTask=new FutureTask(myThread);
        new Thread(futureTask).start();
        //获取返回的值
        String o = (String) futureTask.get();
        System.out.println(o);
    }
}
class MyThread implements Callable<String>{

    @Override
    public String call() throws Exception {
        System.out.println("call");
        return "hhh";
    }
}