使用java.util.concurrent包编写一个延时执行的任务

package com.letv.lazybox.task;/**     若干参赛者参加竞走比赛,每组比赛有规定不同的全程米数,总赛时长;运动员若在规定赛时未跑完全程则出局;最后输出比赛成绩*/import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.Iterator;import java.util.List;import java.util.concurrent.Callable;import java.util.concurrent.ConcurrentHashMap;import java.util.concurrent.ExecutionException;import java.util.concurrent.Executors;import java.util.concurrent.Future;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;public class TaskContraller {    public static void main(String[] args) {        // 初始化        ConcurrentHashMap<String, WalkingTask> walktaskmap = new ConcurrentHashMap<String, WalkingTask>();        Player tom = new Player("Tom", 10, 2000, 30);        Player kitty = new Player("kitty", 80, 3000, 10);        walktaskmap.put("Tom", new WalkingTask(tom));        walktaskmap.put("kitty", new WalkingTask(kitty));        // 创建存放结果状态的列表        List<Future<Player>> futureList = new ArrayList<Future<Player>>();        System.out.println("StartTime="                + new SimpleDateFormat("HH:mm:ss").format(new Date(System                        .currentTimeMillis())));        // 创建线程池        final ScheduledExecutorService pool = Executors                .newScheduledThreadPool(50);        Iterator<String> ite = walktaskmap.keySet().iterator();        while (ite.hasNext()) {            String name = ite.next();            WalkingTask walkingTask = walktaskmap.get(name);            System.out.println(name + " is ready to walking...!");            // (异步)立即开始执行比赛任务            Future<Player> future = pool.submit(walkingTask);            // (异步)延时执行停止任务            StopTask stopTask = new StopTask(walktaskmap, name);            pool.schedule(stopTask, walkingTask.getPlayer().getTotalSeconds(),                    TimeUnit.SECONDS);            futureList.add(future);        }        System.out.println(".....main thread....");        // 异步等待结束输出结果        try {            for (Future<Player> fu : futureList) {                Player player = fu.get();                System.out.println("result-------->\n" + player.toString());            }        } catch (InterruptedException e) {            e.printStackTrace();        } catch (ExecutionException e) {            e.printStackTrace();        } finally {            // 关闭线程池:当前未完成线程接续执行,不再接受新线程            pool.shutdown();        }    }}/** * 竞走比赛任务类:有返回值 */class WalkingTask implements Callable<Player> {    private boolean isStop = false;// 是否中止比赛    private Player player;// 运动员    public boolean isStop() {        return this.isStop;    }    public void setStop(boolean isStop) {        this.isStop = isStop;    }    public Player getPlayer() {        return this.player;    }    public void setPlayer(Player player) {        this.player = player;    }    public WalkingTask(Player player) {        this.player = player;    }    @Override    public Player call() {        for (int i = 1; i <= this.player.getMeters(); i++) {            try {                Thread.sleep(this.player.getMillsecond());            } catch (InterruptedException e) {                e.printStackTrace();            }            System.out.println(this.player.getName() + " run:" + i + " m!");            if (this.isStop) {                Result res = new Result(false, i, this.player.getMillsecond()                        * i / 1000);                this.player.setResult(res);                return this.player;            }        }        this.player.setResult(new Result(true, this.player.getMeters(),                this.player.getMillsecond() * this.player.getMeters() / 1000));        return this.player;    }}/** * 通知比赛中止任务类:无返回值 */class StopTask implements Runnable {    private final String key;// 运动员姓名    private final ConcurrentHashMap<String, WalkingTask> mytasks;    public StopTask(ConcurrentHashMap<String, WalkingTask> mytasks, String name) {        this.mytasks = mytasks;        this.key = name;    }    @Override    public void run() {        this.mytasks.get(this.key).setStop(true);        String endTime = new SimpleDateFormat("HH:mm:ss").format(new Date(                System.currentTimeMillis()));        System.out.println("[ " + this.key + " ] GAME OVER ! EndTime ="                + endTime);    }}/** * 运动员 */class Player {    private String name;// 姓名    private int meters;// 参赛总里程数    private int millsecond;// 每跑一米用时    private int totalSeconds;// 总赛时    private Result result;// 成绩    public Player(String name, int meters, int millsecond, int totalSeconds) {        this.name = name;        this.meters = meters;        this.millsecond = millsecond;        this.totalSeconds = totalSeconds;    }    public Result getResult() {        return this.result;    }    public void setResult(Result result) {        this.result = result;    }    public String getName() {        return this.name;    }    public void setName(String name) {        this.name = name;    }    public int getMeters() {        return this.meters;    }    public void setMeters(int meters) {        this.meters = meters;    }    public int getMillsecond() {        return this.millsecond;    }    public void setMillsecond(int millsecond) {        this.millsecond = millsecond;    }    public int getTotalSeconds() {        return this.totalSeconds;    }    public void setTotalSeconds(int totalSeconds) {        this.totalSeconds = totalSeconds;    }    @Override    public String toString() {        return "Player [name=" + this.name + ", meters=" + this.meters                + ", millsecond=" + this.millsecond + ", totalSeconds="                + this.totalSeconds + ", result=" + this.result.toString()                + "]";    }}/** * 比赛成绩 */class Result {    private boolean finished;// 是否完成    private int meters;// 跑了多少米    private int times;// 用时    public Result(boolean finished, int meters, int times) {        this.finished = finished;        this.meters = meters;        this.times = times;    }    public boolean getFinished() {        return this.finished;    }    public void setFinished(boolean finished) {        this.finished = finished;    }    public int getMeters() {        return this.meters;    }    public void setMeters(int meters) {        this.meters = meters;    }    public int getTimes() {        return this.times;    }    public void setTimes(int times) {        this.times = times;    }    @Override    public String toString() {        return "Result [finished=" + this.finished + ", meters=" + this.meters                + ", times=" + this.times + "]";    }}