线程池与Callable更配哦

概述

Callable介绍见：http://blog.csdn.net/zengmingen/article/details/53288119

多线程介绍见：http://blog.csdn.net/zengmingen/article/details/53284999

代码

TaskCallable.java

package multithreading.pool;import java.util.concurrent.Callable;public class TaskCallable implements Callable<String>{/**线程编号*/private int tNo;public TaskCallable(int tNo){this.tNo=tNo;}@Overridepublic String call() throws Exception {String tName=Thread.currentThread().getName();long currentTimeMillis = System.currentTimeMillis();System.out.println(tNo+"-"+tName+" start time is："+currentTimeMillis/1000);try {Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(tNo+"-"+tName+ " is working...");return "the thread is "+tNo;}}

TestPool.java

package multithreading.pool;import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;public class TestPool {public static void main(String[] args) throws Exception, ExecutionException {List<Future<String>> futures = new ArrayList<Future<String>>();ExecutorService newFixedThreadPool = Executors.newFixedThreadPool(2);for (int i = 0; i < 5; i++) {Future<String> future = newFixedThreadPool.submit(new TaskCallable(i));futures.add(future);}// 打印结果for (Future<String> f : futures) {boolean done = f.isDone();// 从结果的打印顺序可以看到，即使未完成，也会阻塞等待System.out.println(done ? "已完成" : "未完成");//从Future中get结果，这个方法是会被阻塞的，一直要等到线程任务返回结果System.out.println("已完成线程返回future结果： " + f.get());}newFixedThreadPool.shutdown();}}

运行结果

0-pool-1-thread-1 start time is：1479808023
未完成
1-pool-1-thread-2 start time is：1479808023
0-pool-1-thread-1 is working...
1-pool-1-thread-2 is working...
已完成线程返回future结果： the thread is 0
已完成
已完成线程返回future结果： the thread is 1
未完成
2-pool-1-thread-1 start time is：1479808024
3-pool-1-thread-2 start time is：1479808024
3-pool-1-thread-2 is working...
2-pool-1-thread-1 is working...
4-pool-1-thread-2 start time is：1479808026
已完成线程返回future结果： the thread is 2
已完成
已完成线程返回future结果： the thread is 3
未完成
4-pool-1-thread-2 is working...
已完成线程返回future结果： the thread is 4