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Thread: Java calculation application

  1. #1
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    Default 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);
    //
    // }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Java calculation application

    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.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Java calculation application

    Quote Originally Posted by Norm View Post
    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());

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Java calculation application

    This is the part of my code that should have calculated and displayed the area:
    What that statement could do is set the value of the variable named: area. It would NOT display its value anywhere.

    What errors do you get when you execute the program? Please copy the full text of the error messages and paste it here.

    Please edit your post and wrap your code with code tags:
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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