import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.Callable;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.Future;

/**

 * 如果你想在任务返回后带一个返回值，可以实现Callable接口<br>

 * executorService.submit返回带结果的future对象[执行了call方法后返回]<br>

 * 调用get会一直阻塞直到结果返回

 *

 * @date:2018年6月26日

 * @author:zhangfs

 *

 *

 */

public class CallableDemo implements Callable<String> {

    private int id;

    public CallableDemo(int id) {

        this.id = id;

    }

    public static void main(String[] args) {

        ExecutorService executorService = Executors.newCachedThreadPool();

        List<Future<String>> results = new ArrayList<Future<String>>();

        for (int i = 0; i < 10; i++) {

            results.add(executorService.submit(new CallableDemo(i)));

        }

        for (Future<String> future : results) {

            try {

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

            } catch (InterruptedException | ExecutionException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            } finally {

                executorService.shutdown();

            }

        }

    }

    @Override

    public String call() throws Exception {

        // TODO Auto-generated method stub

        return "Result of CallableDemo is " + id;

    }

}