java 线程池批量执行

package com.test;

import java.util.List;
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 TestMultiThreads {

	private static Integer num = 0;

	//Test Shutdown 
	public static void executor1() throws Exception{
		ExecutorService pool = Executors.newFixedThreadPool(100);

		CompletionService completionService = new ExecutorCompletionService(
				pool);

		for (int i = 0; i < 100; i++) {
			completionService.submit(new Callable() {

				@Override
				public Integer call() throws Exception {
					synchronized (num) {
						return ++num;
					}
					
				}

			});
		}
		//pool.shutdown();//启动一次顺序关闭，执行以前提交的任务，但不接受新任务。
		for (int i = 0; i < 100; i++) {

			Future future = completionService.take();
			System.out.println(future.get());

		}
		
		System.out.println("==================================");
		
		if(pool.isShutdown()){
			System.out.println("pool is shutdown!");
		}
		
		for (int i = 0; i < 100; i++) {
			completionService.submit(new Callable() {

				@Override
				public Integer call() throws Exception {
					synchronized (num) {
						return ++num;
					}
					
				}

			});
		}
		for (int i = 0; i < 100; i++) {

			Future future = completionService.take();
			System.out.println(future.get());

		}
		//启动一次顺序关闭，执行以前提交的任务，但不接受新任务。
		pool.shutdown();// 必须要有shutdown否则出错
	}
	
	//Test ShutdownNow
	public static void executor2() throws InterruptedException, ExecutionException{
		
		ExecutorService pool = Executors.newFixedThreadPool(100);
		CompletionService completionService = new ExecutorCompletionService(pool);
		
		for(int i =0 ;i < 100;i++){
			
			completionService.submit(new Callable() {

				@Override
				public Integer call() throws Exception {
					//不一定线程安全
					return ++num;
				}
			});
			
		}
		
		
		List restRunList = null;
		for(int i=0;i<100;i++){
			
			if(i>50){
				restRunList = pool.shutdownNow();//不成功
				
			}
			System.out.println(completionService.take().get());
		}
		
		System.out.println("===============================");
		//restRunList为null
		if(restRunList == null){
			return;
		}
		for(Runnable r : restRunList ){
			System.out.println(r);
			r.run();
		}
		
		
	}
	
	public static void main(String[] args) throws Exception {
		
		executor1();
		executor2();

	}

}

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==================================
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===============================