多线程

package com.bkc.bpmp.modules.external.service;
 
import java.util.concurrent.*;
import java.util.Date;
import java.util.List;
import java.util.ArrayList;
 
/**
* Java线程：有返回值的线程
* 
* @author wb_qiuquan.ying
*/
@SuppressWarnings("unchecked")
public class Test
{
public static void main(String[] args)
throws ExecutionException, InterruptedException
{
System.out.println("----程序开始运行----");
Date date1 = new Date();
 
int taskSize = 5;
// 创建一个线程池
ExecutorService pool = Executors.newFixedThreadPool(taskSize);
// 创建多个有返回值的任务
List<Future> list = new ArrayList<Future>();
for (int i = 0; i < taskSize; i++)
{
Callable c = new MyCallable(i + " ");
// 执行任务并获取Future对象
Future f = pool.submit(c);
// System.out.println(">>>" + f.get().toString());
list.add(f);
}
// 关闭线程池
pool.shutdown();
 
// 获取所有并发任务的运行结果
for (Future f : list)
{
// 从Future对象上获取任务的返回值，并输出到控制台
System.out.println(">>>" + f.get().toString());
}
 
Date date2 = new Date();
System.out.println("----程序结束运行----，程序运行时间【" + (date2.getTime() - date1.getTime()) + "毫秒】");
}
}
 
class MyCallable implements Callable<Object>
{
private String taskNum;
 
MyCallable(String taskNum)
{
this.taskNum = taskNum;
}
 
public Object call()
throws Exception
{
System.out.println(">>>" + taskNum + "任务启动");
Date dateTmp1 = new Date();
Thread.sleep(1000);
Date dateTmp2 = new Date();
long time = dateTmp2.getTime() - dateTmp1.getTime();
System.out.println(">>>" + taskNum + "任务终止");
return taskNum + "任务返回运行结果,当前任务时间【" + time + "毫秒】";
}
}