Thread: Java calculation application

Hello I'm trying to create an application that will calculate an area based on width and height that a user enters and then use the area to calculate a cost based on a fixed rate. I get past compile errors but when I enter a height and weight it doesn't calculate and show an area. I tried to set a break point and debug but don't get anything useful with that. If someone could help me with this I would be greatful. Here is my code:

/**

*Calculates and displays commercial door estimate.
*

* @author (Shawn Newton)

* @version (10/2/2012)

*/

import java.awt.Image;
import javax.imageio.ImageIO;
import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.text.NumberFormat;

public class CalculatorPanel extends JPanel
{
double aRate = 20.00;
double hRate = 15.00;

private JButton push;
private NumberFormat fmt;
private JLabel heightLabel, widthLabel, areaLabel, costLabel;
private JTextField height, width, area, cost;

public CalculatorPanel()
{
heightLabel = new JLabel ("Height: \n\t");
widthLabel = new
JLabel ( "Width: \n\t");
areaLabel = new
JLabel ( "Area: \n\t");
costLabel = new
JLabel ( "Cost: \n\t");

ButtonListener listener = new ButtonListener();
fmt = NumberFormat.getCurrencyInstance();
height = new JTextField (5);
width = new
JTextField (5);
area = new JTextField (5);
cost = new JTextField (5);
//cost = new JTextField (5);

push = new JButton("Calculate");
push.addActionListener( new
ButtonListener());
// cost.addActionListener ( new PaymentListener());
//num.addActionListener ( new PaymentListener());
//rate.addActionListener ( new PaymentListener());

add ( push );

add (heightLabel);

add (height);

add (widthLabel);

add (width);

add (areaLabel);

add (area);

add (costLabel);

add (cost);

setPreferredSize ( new

Dimension( 500, 250 ));

setBackground ( Color.cyan );
}

private class ButtonListener implements ActionListener
{
//
// Updates the monthly payment when the button is pushed.
//

public void actionPerformed (ActionEvent event)
{

double area = Integer.parseInt(height.toString()) * Integer.parseInt(width.toString());

}
}

public static void main ()

{

JFrame frame = new JFrame ("Door Cost Estimation");

frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

CalculatorPanel panel = new CalculatorPanel();

frame.getContentPane().add(panel);

frame.pack();

frame.setVisible(true);

}

public static void main (String[] args)

{
JFrame frame = new JFrame ( "CalculatorPanel");
frame.setDefaultCloseOperation ( JFrame.EXIT_ON_CLOSE);

CalculatorPanel panel = new CalculatorPanel ();

frame.getContentPane().add( panel );
frame.pack();
frame.setVisible( true );

}
}

//Math.pow(base, exponent) /// 2^3
// public String toString()
//
// {
//
// NumberFormat fmt = NumberFormat.getCurrencyInstance();
//
// return fmt.format(monthPayLabel);
//
// }

Originally Posted by Norm

Where does the code compute and display the value you want to see?

Please edit your post and wrap your code with code tags:
[code=java]
<YOUR CODE HERE>
[/code]
to get highlighting and preserve formatting.

This is the part of my code that should have calculated and displayed the area:

double area = Integer.parseInt(height.toString()) * Integer.parseInt(width.toString());