timertrial.java

这是我们写的考试系统！！java编写的！！不是很大！！希望有用

package basic.timer;

 

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

 

public class TimerTrial {

    private static Timer _timer = new Timer();

    private static FirstTask _firstTask = new FirstTask();

    private static SecondTask _secondTask = new SecondTask();

    private static ThirdTask _thirdTask = new ThirdTask();

    private static FourthTask _fourthTask = new FourthTask();

    private static long _delay = 0;

    private static long _period = 0;

    private static Date _executeTime = null;

 

    public TimerTrial(long delay, long period) {

        _delay = delay * 1000;

        _period = period * 1000;

        _executeTime = new Date();

    }

 

    public static void main(String[] args) {

        TimerTrial timerTrial = new TimerTrial(3, 2);// 3 means three

        // milliseconds

        timerTrial.startUp();
       // timerTrial.shutDown();



    }

 

    private void startUp() {

        _timer.schedule(_firstTask, _delay);// 指定经过一个时间段(Here is 3

        // seconds)才做的事情。

        _timer.schedule(_secondTask, _executeTime);// 在指定的时间点做一件事情，如果被制定的时间已经是当前系统的过去时间，则立刻执行run()方法。

        _timer.schedule(_thirdTask, _delay, _period);// 从指定经过一个时间段（_delay）后，每隔一段时间（_period）重复做一件事情。

        _timer.schedule(_fourthTask, _executeTime, _period);// 在指定的时间点做一件事情，然后每隔一段时间（_period）重复的做同一件事情

    }

 

    private void shutDown() {

        _timer.cancel();// 关掉定时器

    }

}

 

class FirstTask extends TimerTask {

    public void run() {

        System.err.println("First.Schedules the specified task for execution after the specified delay.");

        System.err.println("");

    }

}

 

class SecondTask extends TimerTask {

    public void run() {

        System.err.println("Second.Schedules the specified task for execution at the specified time.");

        System.err.println("");

    }

}

 

class ThirdTask extends TimerTask {

    public void run() {

        System.out

                .println("Third.Schedules the specified task for repeated fixed-delay execution, beginning after the specified delay.");

        System.err.println("");

    }

}

class FourthTask extends TimerTask {

    public void run() {

        System.err

                .println("Fourth.Schedules the specified task for repeated fixed-delay execution, beginning at the specified time.");

        System.err.println("");

    }

}