How to create the digital clock in java swing application ?

Question

I want to create the running digital clock in my java swing application. Can someone throw some light on this how to do this ? Or If someone has done it then can someone pl. paste the code ?
Thanks.

Answer 1

hi prah_Rich,
I have created a digital clock you can use. You will most likely have to change some things to use it in another app although that shouldn't be too hard. A least it can give you some ideas on how to create one of your own. There are three classes.One that creates the numbers. a gui class and frame class.
cheers:)
Hex45
import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.awt.geom.*;
public class DigitalClock extends Panel{
          BasicStroke stroke = new BasicStroke(4,BasicStroke.CAP_ROUND,
                                           BasicStroke.JOIN_BEVEL);
          String hour1, hour2;
          String minute1, minute2;
          String second1, second2;
          String mill1, mill2, mill3;
          int hr1, hr2;
          int min1, min2;
          int sec1, sec2;
          int mll1, mll2,mll3;       
    public void update(Graphics g){
         paint(g);
     public void paint(Graphics g){
          Graphics2D g2D = (Graphics2D)g;
          DigitalNumber num = new DigitalNumber(10,10,20,Color.cyan,Color.black);     
          GregorianCalendar c = new GregorianCalendar();
          String hour = String.valueOf(c.get(Calendar.HOUR));
          String minute = String.valueOf(c.get(Calendar.MINUTE));
          String second = String.valueOf(c.get(Calendar.SECOND));
          String milliSecond = String.valueOf(c.get(Calendar.MILLISECOND));
          if(hour.length()==2){
               hour1 = hour.substring(0,1);
               hour2 = hour.substring(1,2);
          }else{
               hour1 = "0";
               hour2 = hour.substring(0,1);
          if(minute.length()==2){
               minute1 = minute.substring(0,1);
               minute2 = minute.substring(1,2);
          }else{
               minute1 = "0";
               minute2 = minute.substring(0,1);
          if(second.length()==2){
               second1 = second.substring(0,1);
               second2 = second.substring(1,2);
          }else{
               second1 = "0";
               second2 = second.substring(0,1);
          if(milliSecond.length()==3){
               mill1 = milliSecond.substring(0,1);
               mill2 = milliSecond.substring(1,2);
               mill3 = milliSecond.substring(2,3);
          }else if(milliSecond.length()==2){
               mill1 = "0";
               mill2 = milliSecond.substring(0,1);
               mill3 = milliSecond.substring(1,2);
          }else{
               mill1 = "0";
               mill2 = "0";
               mill3 = milliSecond.substring(0,1);
          hr1  = Integer.parseInt(hour1);     
          hr2  = Integer.parseInt(hour2);
          min1 = Integer.parseInt(minute1);
          min2 = Integer.parseInt(minute2);
          sec1 = Integer.parseInt(second1);
          sec2 = Integer.parseInt(second2);
          mll1 = Integer.parseInt(mill1);
          mll2 = Integer.parseInt(mill2);
          g2D.setStroke(stroke);
          g2D.setPaint(Color.cyan);
          num.setSpacing(true,8);
          num.setSpacing(true,8);
          if(hr1==0&hr2==0){
               num.drawNumber(1,g2D);
               num.setLocation(40,10);
               num.drawNumber(2,g2D);
          else{
               if(!(hr1 == 0)){     
                    num.drawNumber(hr1,g2D);
               num.setLocation(40,10);
               num.drawNumber(hr2,g2D);
          num.setLocation(70,10);
          num.drawNumber(DigitalNumber.DOTS,g2D);
          num.setLocation(100,10);
          num.drawNumber(min1,g2D);
          num.setLocation(130,10);
          num.drawNumber(min2,g2D);
          num.setLocation(160,10);
          num.drawNumber(DigitalNumber.DOTS,g2D);
          num.setLocation(190,10);
          num.drawNumber(sec1,g2D);
          num.setLocation(220,10);
          num.drawNumber(sec2,g2D);
          /*num.setLocation(250,10);
          num.drawNumber(DigitalNumber.DOTS,g2D);
          num.setLocation(280,10);
          num.drawNumber(mll1,g2D);
          num.setLocation(310,10);
          num.drawNumber(mll2,g2D);
          g2D.setPaint(Color.cyan);
          if((c.get(Calendar.AM_PM))==Calendar.AM){               
               g2D.drawString("AM",260,20);
          }else{
               g2D.drawString("PM",260,20);
     String dayOfweek = "";     
     switch(c.get(Calendar.DAY_OF_WEEK)){
          case(Calendar.SUNDAY):
               dayOfweek = "Sunday, ";
               break;
          case(Calendar.MONDAY):
               dayOfweek = "Monday, ";
               break;
          case(Calendar.TUESDAY):
               dayOfweek = "Tuesday, ";
               break;
          case(Calendar.WEDNESDAY):
               dayOfweek = "Wednesday, ";
               break;
          case(Calendar.THURSDAY):
               dayOfweek = "Thursday, ";
               break;
          case(Calendar.FRIDAY):
               dayOfweek = "Friday, ";
               break;
          case(Calendar.SATURDAY):
               dayOfweek = "Saturday, ";
               break;
     String month = "";     
     switch(c.get(Calendar.MONTH)){
          case(Calendar.JANUARY):
               month = "January ";
               break;
          case(Calendar.FEBRUARY):
               month = "February ";
               break;
          case(Calendar.MARCH):
               month = "March ";
               break;
          case(Calendar.APRIL):
               month = "April ";
               break;
          case(Calendar.MAY):
               month = "May ";
               break;
          case(Calendar.JUNE):
               month = "June ";
               break;
          case(Calendar.JULY):
               month = "July ";
               break;
          case(Calendar.AUGUST):
               month = "August ";
               break;
          case(Calendar.SEPTEMBER):
               month = "September ";
               break;
          case(Calendar.OCTOBER):
               month = "October ";
               break;
          case(Calendar.NOVEMBER):
               month = "November ";
               break;
          case(Calendar.DECEMBER):
               month = "December ";
               break;
     int day = c.get(Calendar.DAY_OF_MONTH);
     int year = c.get(Calendar.YEAR);
     Font font = new Font("serif",Font.PLAIN,24);
     g2D.setFont(font);
     g2D.drawString(dayOfweek+month+day+", "+year,10,80);
     public static void main(String args[]){
          AppFrame aframe = new AppFrame("Digital Clock");
          Container cpane = aframe.getContentPane();
          final DigitalClock dc = new DigitalClock();
          dc.setBackground(Color.black);
          cpane.add(dc,BorderLayout.CENTER);
          aframe.setSize(310,120);
          aframe.setVisible(true);
          class Task extends TimerTask {
             public void run() {
                  dc.repaint();
          java.util.Timer timer = new java.util.Timer();
         timer.schedule(new Task(),0L,250L);
class DigitalNumber {
     private float x=0;
     private float y=0;
     private float size=5;
     private int number;
     private Shape s;
     private float space = 0;
     public static final int DOTS = 10;
     private Color on,off;
     DigitalNumber(){          
          this(0f,0f,5f,Color.cyan,Color.black);          
     DigitalNumber(float x,float y, float size,Color on,Color off){
          this.x = x;
          this.y = y;
          this.size = size;
          this.on = on;
          this.off = off;
     public void drawNumber(int number,Graphics2D g){
          int flag = 0;
          switch(number){
               case(0):          
                    flag = 125;
                    break;
               case(1):
                    flag = 96;
                    break;
               case(2):
                    flag = 55;
                    break;
               case(3):
                    flag = 103;
                    break;
               case(4):
                    flag = 106;
                    break;
               case(5):
                    flag = 79;
                    break;
               case(6):
                    flag = 94;
                    break;
               case(7):
                    flag = 97;
                    break;
               case(8):
                    flag = 127;
                    break;
               case(9):
                    flag = 107;
                    break;
               case(DOTS):
                    GeneralPath path = new GeneralPath();
                    path.moveTo(x+(size/2),y+(size/2)-1);
                    path.lineTo(x+(size/2),y+(size/2)+1);
                    path.moveTo(x+(size/2),y+(size/2)+size-1);
                    path.lineTo(x+(size/2),y+(size/2)+size+1);
                    g.setPaint(on);
                    g.draw(path);     
                    return;
          //Top          
          if((flag & 1) == 1){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath Top = new GeneralPath();
          Top.moveTo(x + space, y);
          Top.lineTo(x + size - space, y);
          g.draw(Top);
          //Middle
          if((flag & 2) == 2){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath Middle = new GeneralPath();
          Middle.moveTo(x + space, y + size); 
          Middle.lineTo(x + size - space,y + size);     
          g.draw(Middle);
          //Bottom
          if((flag & 4) == 4){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath Bottom = new GeneralPath();
          Bottom.moveTo(x + space, y + (size * 2));  
          Bottom.lineTo(x + size - space, y + (size * 2));
          g.draw(Bottom);
          //TopLeft
          if((flag & 8) == 8){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath TopLeft = new GeneralPath();     
          TopLeft.moveTo(x, y + space);
          TopLeft.lineTo(x, y + size - space);          
          g.draw(TopLeft);
          //BottomLeft
          if((flag & 16) == 16){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath BottomLeft = new GeneralPath();     
          BottomLeft.moveTo(x, y + size + space);
          BottomLeft.lineTo(x, y + (size * 2) - space);
          g.draw(BottomLeft);
          //TopRight
          if((flag & 32) == 32){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath TopRight = new GeneralPath();     
          TopRight.moveTo(x + size, y + space);
          TopRight.lineTo(x + size, y + size - space);
          g.draw(TopRight);
          //BottomRight
          if((flag & 64) == 64){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath BottomRight = new GeneralPath();     
          BottomRight.moveTo(x + size, y + size + space);
          BottomRight.lineTo(x + size, y + (size * 2) - space);
          g.draw(BottomRight);
     public void setSpacing(boolean spacingOn){
          if(spacingOn == false){
               space = 0;
          else{
               this.setSpacing(spacingOn,5f);
     public void setSpacing(boolean spacingOn,float gap){
          if(gap<2){
               gap = 2;
          if(spacingOn == true){
               space = size/gap;
     public void setLocation(float x,float y){
          this.x = x;
          this.y = y;
     public void setSize(float size){
          this.size = size;
class AppFrame extends JFrame{
     AppFrame(){
          this("Demo Frame");
     AppFrame(String title){
          super(title);
          setSize(500,500);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}