clockdisplay.java

一款用blueJ编程的数字电子时钟

import java.util.*;
import javax.swing.*;
public class ClockDisplay extends JLabel implements Runnable
{
    private NumberDisplay hours;
    private NumberDisplay minutes;
    private NumberDisplay seconds;
    private String displayString;   
    public void run(){
       try{
        
        int i =100;
        while(i>=0){
            //System.out.println(getTime());
            setText(getTime());
            Thread.sleep(999);
            timeTick();
            i--;
        }
    }catch(Exception e){
    }
    }
    
    public ClockDisplay()
    {
        hours = new NumberDisplay(24);
        minutes = new NumberDisplay(60);
        seconds = new NumberDisplay(60);
        Calendar calendar = new GregorianCalendar();
        int a= calendar.get(Calendar.HOUR_OF_DAY);
        int b= calendar.get(Calendar.MINUTE);
        int c= calendar.get(Calendar.SECOND);
        setTime(a,b,c);
        updateDisplay();
    }
    
    public ClockDisplay(int hour, int minute,int second)
    {
        hours = new NumberDisplay(24);
        minutes = new NumberDisplay(60);
        seconds = new NumberDisplay(60);
        setTime(hour, minute,second);
    }

    public void timeTick()
    {
        
        seconds.increment();
        if(seconds.getValue() == 0) { 
            hours.increment();
        }
        updateDisplay();
    }

    public void setTime(int hour, int minute,int second)
    {
        hours.setValue(hour);
        minutes.setValue(minute);
        seconds.setValue(minute);
        updateDisplay();
    }

    public String getTime()
    {
        return displayString;
    }
    
    private void updateDisplay()
    {
        displayString = hours.getDisplayValue() + ":" + 
                        minutes.getDisplayValue()+":"+seconds.getDisplayValue();
    }
}