CODEWITHSUNDEEP
javaswinguser-interface
Endured_Programmer
Endured_Programmer

Reputation: 45

Why is my window not showing up?

Just finished coding this but for some reason when I run it, my window won't show at all! Anyone have any ideas?

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

public class RetailPriceCalculator extends JFrame
{
private InputPanel inputs;
private OutputPanel outputs;
private ExplanationPanel banner;
private JPanel buttonPanel;
private JButton calcButton;
private JButton exitButton;

public void RetailPriceCalculatorGUI()
{
    setTitle("Retail Price Calculator");

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    setLayout(new BorderLayout());

    banner = new ExplanationPanel();
    inputs = new InputPanel();
    outputs = new OutputPanel();

    buildButtonPanel();

    add(banner, BorderLayout.NORTH);
    add(inputs, BorderLayout.WEST);
    add(outputs, BorderLayout.EAST);
    add(buttonPanel, BorderLayout.SOUTH);

    pack();
    setVisible(true);
}

public void buildButtonPanel()
{
    buttonPanel = new JPanel();

    calcButton = new JButton("Calculate");
    exitButton = new JButton("Exit");

    calcButton.addActionListener(new CalcButtonListener());
    exitButton.addActionListener(new ExitButtonListener());

    buttonPanel.add(calcButton);
    buttonPanel.add(exitButton);
}

private class CalcButtonListener implements ActionListener
{
    public void actionPerformed (ActionEvent e)
    {
        double wholesale, markup, retail;

        wholesale = inputs.getWholesale();
        markup = inputs.getMarkup();

        retail = wholesale * (1 + markup);

        outputs.setRetail(retail);
    }
}

private class ExitButtonListener implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
        System.exit(0);
    }
}

public static void main(String[] args)
    {
        new RetailPriceCalculator();
    } 

}

The ExplanationPanel(), InputPanel(), and OutputPanel() classes are simple and shouldn't get in the way of the code. I just run it, than it all of a sudden says it's terminated, and no window, at all! Not even an empty frame!

Upvotes: 1

Views: 80

Answers (2)

MadProgrammer
MadProgrammer

Reputation: 347184

You code has no executable constructor (only the default constructor, which isn't doing anything for you)

Based on what I can tell from you code, you want to change public void RetailPriceCalculatorGUI() { to public RetailPriceCalculator() {

Having said, I encourage you to avoid extending directly from top level containers like JFrame, you're locking yourself into a single use case and you're not adding any new/reusable functionality to the class. Better to start with a JPanel and build up the UI from then add it to what ever container you want

Upvotes: 3

Viet
Viet

Reputation: 3409

Seem you are having typo in RetailPriceCalculator method.

Change public void RetailPriceCalculatorGUI() to constructor public RetailPriceCalculator()

or update your main method to:

new RetailPriceCalculator().RetailPriceCalculatorGUI();

Upvotes: 3

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