java 线程池批量执行

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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<Integer>(pool);for (int i = 0; i < 100; i++) {completionService.submit(new Callable<Integer>() {@Overridepublic 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<Integer> 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<Integer>() {@Overridepublic Integer call() throws Exception {synchronized (num) {return ++num;}}});}for (int i = 0; i < 100; i++) {Future<Integer> 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 ShutdownNowpublic static void executor2() throws InterruptedException, ExecutionException{ExecutorService pool = Executors.newFixedThreadPool(100);CompletionService completionService = new ExecutorCompletionService<Integer>(pool);for(int i =0 ;i < 100;i++){completionService.submit(new Callable<Integer>() {@Overridepublic Integer call() throws Exception {//不一定线程安全return ++num;}});}List<Runnable> 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nullif(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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