使用线程池以及FutureTask管理多线程任务

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此处为一个示例：

package com.ihuning.javase.demo.thread;import java.util.ArrayList;import java.util.List;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.FutureTask;public class FutureTaskAndExecutor {/** * @param args */public static void main(String[] args) throws Exception {List<FutureTask<Integer>> list = new ArrayList<FutureTask<Integer>>();// 创建线程池，线程池的大小和List.size没有啥必然的关系，一般的原则是<=list.size,多出来浪费不好ExecutorService exec = Executors.newFixedThreadPool(5);List<Task> tasks = new ArrayList<Task>();for (int i = 1; i < 3; i++) {// 创建对象FutureTask<Integer> ft = new FutureTask<Integer>(new GetSum(i));// 添加到list,方便后面取得结果list.add(ft);// tasks.add(new Task(i,ft,false));// 一个个提交给线程池，当然也可以一次性的提交给线程池，exec.invokeAll(list);exec.submit(ft);// System.out.println("-submit the thread task.");}// 开始统计结果Integer total = 2;while (true) {System.out.println("-----------------------------");for (FutureTask<Integer> tempFt : list) {// System.out.print(tempFt + "\t");// System.out.println(tempFt.isDone());tempFt.get();if (tempFt.isDone()) {System.out.println("isDone---------------");total = total + tempFt.get();} else {System.out.println("--------------continue");continue;}}if (total < 0) {break;} else {Thread.sleep(1000);}}// int undoneCount = 0;// for(Task task : tasks)// {// if(!task.isDone())// {// undoneCount++;// }// }////// while(undoneCount > 0)// {// for(Task task : tasks)// {// if(task.isDone())// {// continue;// }// else// {// if(task.getFutureTasks().isDone())// {// Integer result = task.getFutureTasks().get();// System.out.println("--result--: " + result );// task.setDone(true);// undoneCount--;// }// else// {// continue;// }// }// }// Thread.sleep(2000);// }// 处理完毕，一定要记住关闭线程池，这个不能在统计之前关闭，因为如果线程多的话,执行中的可能被打断exec.shutdown();// System.out.println(new Date() + "----shutdown the thread pool----");}}class Task {private int id;private FutureTask<Integer> futureTasks;private boolean done;public Task(int id, FutureTask<Integer> futureTasks, boolean done) {System.out.println("set id: " + id);this.id = id;this.futureTasks = futureTasks;this.done = done;}public int getId() {return id;}public void setId(int id) {this.id = id;}public FutureTask<Integer> getFutureTasks() {return futureTasks;}public void setFutureTasks(FutureTask<Integer> futureTasks) {this.futureTasks = futureTasks;}public boolean isDone() {return done;}public void setDone(boolean done) {this.done = done;}}

package com.ihuning.javase.demo.thread;import java.util.concurrent.Callable;public class GetSum implements Callable<Integer> {private Integer total;public GetSum(Integer total) {this.total = total;}public Integer call() throws Exception {for (int i = 0; i < 10 - total; i++) {//System.out.println("["+Thread.currentThread().getName()+"]" + total);Thread.sleep(1000);}return total;}}

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