Java-Core-Advanced/src/cn/ucaner/core/concurrent/CallableDemo.java at master · Jasonandy/Java-Core-Advanced · GitHub

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/**
 * <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.concurrent;

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.concurrent
* @ClassName：CallableDemo
* @Description：   <p> CallableDemo </p>
* @Author： -
* @CreatTime：2018年6月12日 下午3:50:49
* @Modify By：
* @ModifyTime：  2018年6月12日
* @Modify marker：
* @version    V1.0
 */
public class CallableDemo {

    public static void main(String[] args) {

        ExecutorService exec = Executors.newCachedThreadPool();

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

        for (int i = 0; i < 10; i++) {
            results.add(exec.submit(new TaskWithResult(i)));
        }

        for (Future<String> fs : results) {
            try {
                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();
            }
        }
    }
}

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;
    }
}
//Outputs
//result of TaskWithResult  0
//result of TaskWithResult  1
//result of TaskWithResult  2
//result of TaskWithResult  3
//result of TaskWithResult  4
//result of TaskWithResult  5
//result of TaskWithResult  6
//result of TaskWithResult  7
//result of TaskWithResult  8
//result of TaskWithResult  9