Tutorial: Simple digital watch...

**Turk4n** · 06-28-2008, 01:25 PM

Hello again !
Today I thought I would share one of my "best" works. It took along while and was quite hard to understand and how to use it; But I have fixed it. So here is my Digital watch.(Sorry I can't explain everything quite good, am right now 50% understanding what I have done to get the watch work lol...)
*Side note* It won't show updating time, only the time you requested for.(I have still along way to go with boring java.)

So lets begin...

Code:

public class showtime {

	private float t, m, s;//We setup instructions
	private boolean showsec = true;//allow to show our box of time

	public void set (float h, float min, float sec) {
		
		if (h>=0 && h<24 && min>=0 && min<60 && sec>=0 && sec <60) {//Counter
			t=h;//defenitions
			m=min;//defenitions
			s=sec;//defenitions
		}
		else
			System.out.println ("Wrong hour");//Error message

	}

	public void setshowsec(boolean show) {//function
		showsec = show;
	}

	public float readh() {//function out of our defenition
		return t;
	}

	public float readMin() {//function out of our defenition
		return m;
	}

	public float readSec() {//function out of our defenition
		return s;

	}

	public String toString () {//Print out time in right order,
		String time = t + ":" + m;
		if (showsec)
			time = t + ":" + m + ":" + s;
		return time;
	}

	public void tick() {
		s = s + 1;

		if (s==60){
			s = 0;
			m = m + 1;
		}
		if (m==60){
			m = 0;
			t = t + 1;
		}
		if (t==24){
			t = 0;

		}

	}

}

This code was made logically and took along time to get right construction. Now due to my ability not to be able to explain how this code works; but still I will try and do my best!

Save it on your folder where you keep your java files or so...

Next step lets fix it so it can sync to our local machines time and get it out. This thing we made was kind of a counter, that will check the time and print out it for us(correct me if am wrong!)

Code:

import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;

public class whatsthetime {
	public static void main (String[] arg) {
	}
}

class thetime extends JFrame implements ActionListener {//Our time catcher

	private showtime tp = new showtime ();//reading our timer we made
	private JLabel l;

	public thetime () {//new function
		javax.swing.Timer h = new javax.swing.Timer (1000, this); h.start ();
		Calendar c = Calendar.getInstance ();//function of our watch
		tp.set (c.get (Calendar.HOUR_OF_DAY),//what to show 
			c.get (Calendar.MINUTE),//what to show
			c.get (Calendar.SECOND));//what to show

		l = new JLabel (tp.toString(), JLabel.CENTER);//Gui menu
		add (l);
		l.setOpaque(true);//so it can be seen

		l.setBackground (Color.black);//background color
		l.setForeground (Color.white);//foreground color
		l.setFont (new Font("SanSerif", Font.BOLD, 24));//text size
		setSize (200,75);//box size
		setVisible (true);//if it should be visible
		setDefaultCloseOperation (EXIT_ON_CLOSE);//exit on our demand
	}

	public void actionPerformed (ActionEvent e) {//The catcher
		tp.tick();
		l.setText (tp.toString());//the outputer
	}
}

Well this code is our main function to get out the time, now we can use it freely.

Last part, to print out the time "we have catched"...

Code:

import java.util.*;
import javax.swing.*;

public class time {
	public static void main (String[] arg) {

		showtime tp = new showtime ();//Will look for our main function
		Calendar c = Calendar.getInstance ();//Look up 
		tp.set (c.get (Calendar.HOUR_OF_DAY),//
				c.get (Calendar.MINUTE),//
				c.get (Calendar.SECOND));//
	JOptionPane.showMessageDialog (null, "The time is " + tp.toString());
	}//Printout our time
}

So here is the whole how to printout the time in java. Myself this was kinda fun and challening. I might say this is my last thing for a while with java. So nowdays I will more of my lovely SICP.

P.S, Sorry if I couldn't explain it for you guys as good I have to

Anyways enjoy!