src/cn/ucaner/core/thread/CallableDemo.java

/**
 * <html>
 * <body>
 *  <P> Copyright 1994 JsonInternational</p>
 *  <p> All rights reserved.  - https://github.com/Jasonandy/Java-Core-Advanced </p>
 *  <p> Created by Jason</p>
 *  </body>
 * </html>
 */
package cn.ucaner.core.thread;

import java.util.ArrayList;
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;

/**
* @Package：cn.ucaner.core.thread   
* @ClassName：TaskWithResult   
* @Description：   <p> Callable接口的使用 --- 实现带返回值的任务 </p>
* @Author： - Jeff Lee   
* @CreatTime：2018年4月5日 下午1:16:05   
* @Modify By：   
* @ModifyTime：  2018年4月5日
* @Modify marker：   
* @version    V1.0
 */
// Callable实现类task，指定其类型参数
class TaskWithResult implements Callable<String> {

    private int id;
    public TaskWithResult(int id) {
        this.id = id;
    }

    @Override
    public String call() throws Exception {
        return "RESULT OF TASKWITHRESULT " + id;
    }
}

public class CallableDemo {
	
    public static void main(String[] args) {
        // 创建一个新的线程池
        ExecutorService exec = Executors.newCachedThreadPool();
        // Callable实现类task的返回结果集
        ArrayList<Future<String>> results = new ArrayList<>();
        for (int i = 0; i < 5 ; i++)
            results.add(exec.submit(new TaskWithResult(i)));// 使用submit来启动Tasks

        // 异步计算的结果
        for (Future<String> fs : results)
            try {
                // get阻塞，直至获取结果
                System.out.println(fs.get());
            } catch (InterruptedException e) {
                System.out.println(e);
                e.printStackTrace();
            } catch (ExecutionException e) {
                System.out.println(e);
                e.printStackTrace();
            } finally {
                exec.shutdown();
            }
    }
}
//Outputs
//result of TaskWithResult 0
//result of TaskWithResult 1
//result of TaskWithResult 2
//result of TaskWithResult 3
//result of TaskWithResult 4