Clock

[Martin vanPutten]

Okay... brain fart. I want to make a simple clock. So, I have seconds, minutes, and hous. therefore, in order for it to increase i need the seconds to start off.. (and its digital format) so how do I get the seconds to increase by 1 in exactly 1 second?

[Michael Dunn]

use a timer

[Martin vanPutten]

dah!!! I know how to do that, why didn't i think of that! I really did have a brain fart!!

[Martin vanPutten]

I havn't done this for a while. I get 4 errors. What am i missing or screwing up on?

  /**
 * @(#)Clock.java
 *
 * Clock Applet application
 *
 * @author Martin vanPutten
 * @version 1.00 2006/10/11
 */
 
import java.awt.*;
import java.applet.*;
 
public class Clock extends Applet 
{

int sec = 0;
int min = 0;
int hour = 0;

Timer time;

public void init() 
{

time = new Timer(-100, new TimeListener());

time.start();

}
 
public void paint(Graphics g) 
{

setBackground (Color.black);

g.setColor(Color.yellow);
g.drawString(hour + ":" + min + ":" + sec, 50, 60 );

}
 
public class TimeListener implements ActionListener  

{  

public void actionPerformed(ActionEvent event)  

{  

sec = sec + 1; 
repaint ();  

}  

}

}  

[Martin vanPutten]

nvm, i got it.

[Martin vanPutten]

Now i'm having trouble, can someone help me get it to increment by 1 second.

  /**
 * @(#)Clock.java
 *
 * Clock Applet application
 *
 * @author Martin vanPutten
 * @version 1.00 2006/10/11
 */
 
import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*;
 
public class Clock extends JApplet 
{

int sec = 0;
int min = 0;
int hour = 0;

Timer time;

public void init() 
{

time = new Timer(1, new TimeListener());

if (sec == 0)
time.start();

}
 
public void paint(Graphics g) 
{

setBackground (Color.black);

g.setColor(Color.yellow);
g.drawString(hour + ":" + min + ":" + sec, 50, 60 );

}
 
public class TimeListener implements ActionListener  

{  

public void actionPerformed(ActionEvent event)  

{  

sec++; 
repaint ();  

}  

}

}  

[Martin vanPutten]

nvm, got it again!!

[Martin vanPutten]

k, now i'm stuck, why isn't it repainting and ridding the previous number?

  /**
 * @(#)Clock.java
 *
 * Clock Applet application
 *
 * @author Martin vanPutten
 * @version 1.00 2006/10/11
 */
 
import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*;
 
public class Clock extends JApplet 
{

int sec = 0;
int min = 0;
int hour = 0;

Timer time;

public void init() 
{

time = new Timer(1000, new TimeListener());

if (sec == 0)
time.start();

}
 
public void paint(Graphics g) 
{

setBackground (Color.black);

g.setColor(Color.yellow);
g.drawString(hour + ":" + min + ":" + sec, 50, 60 );

}
 
public class TimeListener implements ActionListener  

{  

public void actionPerformed(ActionEvent event)  

{  

sec++; 
repaint();  

}  

}

}  

[Michael Dunn]

> why isn't it repainting and ridding the previous number?

you need to include, in paint()
super.paint(g);

as you're using JApplet, it might be a whole lot easier
for you to use a JLabel

    
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Clock extends JApplet
{
  int sec = 0;
  int min = 0;
  int hour = 0;
  Timer time;
  JLabel timeLabel = new JLabel("0:0:0");
  public void init()
  {
    JPanel p = new JPanel();
    p.setBackground(Color.BLACK);
    timeLabel.setForeground(Color.YELLOW);
    p.add(timeLabel);
    getContentPane().add(p);
    time = new Timer(1000, new TimeListener());
    time.start();
  }
  public class TimeListener implements ActionListener
  {
    public void actionPerformed (ActionEvent event)
    {
      sec++;
      timeLabel.setText(hour + ":" + min + ":" + sec);
    }
  }
}

[Martin vanPutten]

I forgot super as well, i shouldn't of stopped doing this, I used to know this stuff, thank!!

[Martin vanPutten]

why isn't my background black i said it was?

   /**
 * @(#)Clock.java
 *
 * Clock Applet application
 *
 * @author Martin vanPutten
 * @version 1.00 2006/10/11
 */
 
import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*;
 
public class Clock extends JApplet 
{

int sec = 0;
int min = 0;
int hour = 0;

Timer time;

public void init() 
{

time = new Timer(1000, new TimeListener());

if (sec == 0)
time.start();
 
}
 
public void paint(Graphics g) 
{

super.paint(g);

int screenRes = Toolkit.getDefaultToolkit().getScreenResolution();
    int fontSize = (int)Math.round(40.0 * screenRes / 72.0);
    
Font font = new Font("Arial", Font.PLAIN, fontSize);

setBackground(Color.black);

g.setColor(Color.yellow);
g.setFont(font);

if (sec >= 0 && sec <= 9)
g.drawString(":0" + sec, 270, 60);
else
g.drawString(":" + sec, 270, 60);

if (min >= 0 && min <= 9)
g.drawString(":0" + min, 200, 60);
else
g.drawString(":" + min, 200, 60);

if (hour >= 0 && hour <= 9)
g.drawString("0" + hour, 140, 60);
else
g.drawString("" + hour, 140, 60);

}
 
public class TimeListener implements ActionListener  
{  

public void actionPerformed(ActionEvent event)  
{  

sec++; 
repaint();

if (sec >= 60)
{

sec = 0;
min = min + 1;

}

if (min >= 60)
{

min = 0;
hour = hour + 1;

}  

if (hour >= 24)
hour = 0;

}  

}

} 

[Michael Dunn]

try it like this - using swing's paintComponent()

    
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class TestApplet extends JApplet
{
  public void init()
  {
    setContentPane(new TimePanel());
  }
  public class TimePanel extends JPanel
  {
    int sec = 0;
    int min = 0;
    int hour = 0;
    Timer time;
    public TimePanel()
    {
      setBackground(Color.black);
      int screenRes = Toolkit.getDefaultToolkit().getScreenResolution();
      int fontSize = (int)Math.round(40.0 * screenRes / 72.0);
      Font font = new Font("Arial", Font.PLAIN, fontSize);
      setFont(font);
      time = new Timer(1000, new TimeListener());
      if (sec == 0)
      time.start();
    }
    public void paintComponent(Graphics g)
    {
      super.paintComponent(g);
      g.setColor(Color.yellow);
      if (sec >= 0 && sec <= 9)
      g.drawString(":0" + sec, 270, 60);
      else
      g.drawString(":" + sec, 270, 60);
 
      if (min >= 0 && min <= 9)
      g.drawString(":0" + min, 200, 60);
      else
      g.drawString(":" + min, 200, 60);
 
      if (hour >= 0 && hour <= 9)
      g.drawString("0" + hour, 140, 60);
      else
      g.drawString("" + hour, 140, 60);
    }
    public class TimeListener implements ActionListener
    {
      public void actionPerformed (ActionEvent event)
      {
        sec++;
        repaint();
        if (sec >= 60)
        {
          sec = 0;
          min = min + 1;
        }
        if (min >= 60)
        {
          min = 0;
          hour = hour + 1;
        }
        if (hour >= 24)
        hour = 0;
      }
    }
  }
}

[Martin vanPutten]

How can i set the clock to real time?

[Michael Dunn]

SimpleDateFormat to match the pattern you have
then just
g.drawString( sdf.format(new Date()) , 270, 60);

[Martin vanPutten]

Hmm... I'm confused. Is there more to this?

[Michael Dunn]

> Hmm... I'm confused. Is there more to this?

what's confusing? - the code is much simpler now.

    
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class TestApplet extends JApplet
{
  public void init()
  {
    setContentPane(new TimePanel());
  }
  public class TimePanel extends JPanel
  {
    java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("hh:mm:ss");
    Timer time;
    public TimePanel()
    {
      setBackground(Color.black);
      int screenRes = Toolkit.getDefaultToolkit().getScreenResolution();
      int fontSize = (int)Math.round(40.0 * screenRes / 72.0);
      Font font = new Font("Arial", Font.PLAIN, fontSize);
      setFont(font);
      time = new Timer(1000, new TimeListener());
      time.start();
    }
    public void paintComponent(Graphics g)
    {
      super.paintComponent(g);
      g.setColor(Color.yellow);
      g.drawString(  sdf.format(new java.util.Date())   , 270, 60);
    }
    public class TimeListener implements ActionListener
    {
      public void actionPerformed (ActionEvent event)
      {
        repaint();
      }
    }
  }
}