Programming Forums > Application Development > Java

Nano · May 27th, 2005, 12:42 AM

Hi eveyone,
I am working on a program that will calculate the power generated by increasing the velocity. I made it to work with pressing up and down arrow keys to increase and decrease the velocity, then it output velocity and power by System.out.println. I am trying to get it to work so it output the values on the GUI window.
This is my program so far, I tried to use JLabel, but no luck

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

class KeyListenerTest extends JFrame implements KeyListener
{

   private final double Weigh=600;
   private final double Crr=0.007;
   private final double Cd=0.15;
   private final double A=0.0417;
   private final double p=0.00238;
   private double velocity=0;
   private String power="";
   
   JLabel label;


   public KeyListenerTest(String s)
   {
      super(s);

      setLayout(null);
      addKeyListener(this);
      
      label = new JLabel();
   }

   public void calcPow(double velocity)
   {
 	  power+=((Weigh*Crr)+((0.5*p)*(velocity*velocity)*Cd*A))*velocity;
   }

   public void keyTyped(KeyEvent e)
   {
   }

   public void keyPressed(KeyEvent e)
   {
	  if(e.getKeyCode()==KeyEvent.VK_UP)
      {
      	velocity++;
      }

      if(e.getKeyCode()==KeyEvent.VK_DOWN)
      {
      	velocity--;
      }

      calcPow(velocity);
	  //System.out.println("Velocity is: "+velocity);
	  //System.out.println("Power is: "+power);
	  label.setText(power);
   }

   public void keyReleased(KeyEvent e)
   {
   }
}
public class KeyListenerPower
{
   public static void main(String[] args)
   {
      KeyListenerTest keyListenerTester = new KeyListenerTest("Key Listener Tester");

      keyListenerTester.setSize(100,100);
      keyListenerTester.setVisible(true);
   }
}

Any help will be appreciated.

Easter Bunny · May 27th, 2005, 1:43 AM

it doesn't look like you put your label on the panel.

and then also, it doesn't look like you made a panel to put on your frame either.

Knight · Jun 1st, 2005, 12:06 PM

Yeah, you want to finish making your JLabel. Then, try:

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label = new JLabel(velocity);

Then add the JLabel and other parts, then validate your GUI and it should work for the velocity (I'm a little rusty on Java, so if there is a better way, please enlighten me

)

HeX · Jun 1st, 2005, 12:18 PM

This goes kinda this:

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Container c = getContentPane(); //the container that holds the panel
JPanel panel = new JPanel();
panel.add(label); //puts the label into the panel
c.add(panel); //puts the panel into the container

May 27th, 2005, 12:42 AM	#1
Nano Newbie Join Date: Aug 2004 Location: Hacienda Heights, CA Posts: 8 Rep Power: 0	Display result to GUI window Hi eveyone, I am working on a program that will calculate the power generated by increasing the velocity. I made it to work with pressing up and down arrow keys to increase and decrease the velocity, then it output velocity and power by System.out.println. I am trying to get it to work so it output the values on the GUI window. This is my program so far, I tried to use JLabel, but no luck (Toggle Plain Text) import java.awt.; import java.awt.event.; import javax.swing.; class KeyListenerTest extends JFrame implements KeyListener { private final double Weigh=600; private final double Crr=0.007; private final double Cd=0.15; private final double A=0.0417; private final double p=0.00238; private double velocity=0; private String power=""; JLabel label; public KeyListenerTest(String s) { super(s); setLayout(null); addKeyListener(this); label = new JLabel(); } public void calcPow(double velocity) { power+=((WeighCrr)+((0.5p)(velocityvelocity)CdA))velocity; } public void keyTyped(KeyEvent e) { } public void keyPressed(KeyEvent e) { if(e.getKeyCode()==KeyEvent.VK_UP) { velocity++; } if(e.getKeyCode()==KeyEvent.VK_DOWN) { velocity--; } calcPow(velocity); //System.out.println("Velocity is: "+velocity); //System.out.println("Power is: "+power); label.setText(power); } public void keyReleased(KeyEvent e) { } } public class KeyListenerPower { public static void main(String[] args) { KeyListenerTest keyListenerTester = new KeyListenerTest("Key Listener Tester"); keyListenerTester.setSize(100,100); keyListenerTester.setVisible(true); } } import java.awt.; import java.awt.event.; import javax.swing.; class KeyListenerTest extends JFrame implements KeyListener { private final double Weigh=600; private final double Crr=0.007; private final double Cd=0.15; private final double A=0.0417; private final double p=0.00238; private double velocity=0; private String power=""; JLabel label; public KeyListenerTest(String s) { super(s); setLayout(null); addKeyListener(this); label = new JLabel(); } public void calcPow(double velocity) { power+=((WeighCrr)+((0.5p)(velocityvelocity)CdA))velocity; } public void keyTyped(KeyEvent e) { } public void keyPressed(KeyEvent e) { if(e.getKeyCode()==KeyEvent.VK_UP) { velocity++; } if(e.getKeyCode()==KeyEvent.VK_DOWN) { velocity--; } calcPow(velocity); //System.out.println("Velocity is: "+velocity); //System.out.println("Power is: "+power); label.setText(power); } public void keyReleased(KeyEvent e) { } } public class KeyListenerPower { public static void main(String[] args) { KeyListenerTest keyListenerTester = new KeyListenerTest("Key Listener Tester"); keyListenerTester.setSize(100,100); keyListenerTester.setVisible(true); } } Any help will be appreciated. __________________ why....why u.s. citizen.............

May 27th, 2005, 1:43 AM	#2
Easter Bunny Programmer Join Date: Mar 2005 Location: different places. constantly on the run. Posts: 57 Rep Power: 4	it doesn't look like you put your label on the panel. and then also, it doesn't look like you made a panel to put on your frame either. __________________ There's got to be more to life than being really, really ridiculously good looking

Jun 1st, 2005, 12:06 PM	#3
Knight Newbie Join Date: Jun 2005 Posts: 28 Rep Power: 0	Yeah, you want to finish making your JLabel. Then, try: (Toggle Plain Text) label = new JLabel(velocity); label = new JLabel(velocity); Then add the JLabel and other parts, then validate your GUI and it should work for the velocity (I'm a little rusty on Java, so if there is a better way, please enlighten me )

Jun 1st, 2005, 12:18 PM	#4
HeX Programmer Join Date: May 2005 Location: Kosova Posts: 94 Rep Power: 4	This goes kinda this: (Toggle Plain Text) Container c = getContentPane(); //the container that holds the panel JPanel panel = new JPanel(); panel.add(label); //puts the label into the panel c.add(panel); //puts the panel into the container Container c = getContentPane(); //the container that holds the panel JPanel panel = new JPanel(); panel.add(label); //puts the label into the panel c.add(panel); //puts the panel into the container __________________ (Toggle Plain Text) countdown++; countdown++;

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Programming Forums > Application Development > Java

Display result to GUI window