Java中的线程池

package com.cn.gbx;



import java.util.Date;

import java.util.Random;

import java.util.Timer;

import java.util.TimerTask;

import java.util.concurrent.Callable;

import java.util.concurrent.CompletionService;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.ExecutorCompletionService;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.Future;



public class TestThread {

	

	public static void main(String[] args) {

		

		//Java中提供的三个线程池

//		ExecutorService threadPool = Executors.newCachedThreadPool();

//		ExecutorService threadPool2 = Executors.newFixedThreadPool(3);

//		ExecutorService threadPool3 = Executors.newSingleThreadExecutor();

//		for (int i = 1; i <= 10; ++i) {

//			final int task = i;

//			threadPool.execute( new Runnable() {

//				public void run() {

//					for (int j = 1; j <= 10; ++j) {

//						System.out.println(Thread.currentThread().getName() + " is looping " + j + " at task " + task);

//					}

//				}

//			});

//		}

//		threadPool.shutdown();

		

		

		

		

		// Callable 与 future 的应用

		

//		ExecutorService threadPool = Executors.newCachedThreadPool();

//		Future<String> future = threadPool.submit(

//			new Callable<String>() {

//				@Override

//				public String call() throws Exception {

//					Thread.sleep(2000);

//					return "hello";

//				}

//			}

//		);

//		System.out.println("等待结果：");

//		try {

//			System.out.println("结果为： " + future.get());

//		} catch (InterruptedException e) {

//			// TODO Auto-generated catch block

//			e.printStackTrace();

//		} catch (ExecutionException e) {

//			// TODO Auto-generated catch block

//			e.printStackTrace();

//		}

		

		

		//利用CompletionService提交一组 Callable

		ExecutorService threadPool = Executors.newCachedThreadPool();

		CompletionService<Integer> completionService = new ExecutorCompletionService<Integer>(threadPool);

		for (int i = 1; i <= 10; ++i) {

			final int seq = i;

			completionService.submit(

					new Callable<Integer>() {



						@Override

						public Integer call() throws Exception {

							Thread.sleep(2000);

							return seq;

						}

					}

				);

		}

		for (int i = 1; i <= 10; ++i) {

			try {

				System.out.println(completionService.take().get());

			} catch (InterruptedException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			} catch (ExecutionException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

		}

	}

}