Creating a GUI from text based program

[mike korb]

For my java class i have to create a GUI that will calculate the final price of a purchase item using values entered by the user. I have already wrote the program and it works perfectly, but it is text based right now and I suck at creating GUI's. Here is what I have so far...

import javax.swing.JFrame;


public class PurchaseRedux {


public static void main(String[] args) 
{
JFrame frame = new JFrame ("Purchase Redux");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

frame.getContentPane().add(frame, new PurchaseRedux());

frame.pack();
frame.setVisible(true);	

}

}

PurchaseReduxPanel

/*
* This program will calculate the final price of a purchased item using values entered by the user.
* Author:Mike Korb
* October 31, 2012
*/
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

import java.util.Scanner; 
import java.text.NumberFormat;

public abstract class PurchaseReduxPanel extends JPanel implements ActionListener
{
int quantity;
double subtotal,tax,totalCost, unitPrice;
private JButton totalCostButton = new JButton("Total Cost");
private JLabel subtotalLabel, totalCostLabel,taxLabel ;
JFrame j= new JFrame();




public PurchaseReduxPanel()
{
j.add(this);

totalCostButton.addActionListener(this);…

subtotalLabel = new JLabel ("Subtotal: " + subtotal);
totalCostLabel = new JLabel ("Total Cost: " + totalCost);
taxLabel= new JLabel("Tax: "+ tax );

this.add (totalCostButton);
this.add (subtotalLabel);
this.add(totalCostLabel);
this.add(taxLabel);

setPreferredSize (new Dimension(500, 40));
setBackground (Color.white);
j.setVisible(true);


}




public static void main (String[] args)
{
final double TAX_RATE= 0.06;
int quantity;
double subtotal, tax, totalCost, unitPrice;


Scanner scan= new Scanner(System.in);

NumberFormat fmt1= NumberFormat.getCurrencyInstance();
NumberFormat fmt2= NumberFormat.getPercentInstance();

System.out.print("Enter the quantity: ");
quantity=scan.nextInt();

System.out.print("Enter the unit price: ");
unitPrice=scan.nextDouble();

subtotal= quantity*unitPrice;
tax=subtotal*TAX_RATE;
totalCost= subtotal + tax;


System.out.println("Subtotal: "+ fmt1.format(subtotal));
System.out.println("Tax: "+ fmt1.format(tax)+ " at " + fmt2.format(TAX_RATE));
System.out.println("Total: "+ fmt1.format(totalCost));




}
}

it's a bit messy and i apologize in advance for it.

[Maneesh Godbole]

You had any particular question in mind?
If you are wondering in general, how to write your own UI, check out http://docs.oracle.com/javase/tutorial/uiswing/components/frame.html

This would be better suited on the UI forums.
Moving....

[mike korb]

Maneesh Godbole wrote:You had any particular question in mind?
If you are wondering in general, how to write your own UI, check out http://docs.oracle.com/javase/tutorial/uiswing/components/frame.html

This would be better suited on the UI forums.
Moving....

Okay, I got the program to compile through TrafficLightPanel, but I can't get it to compile through my TrafficLight mainframe can someone please help? Here is what I have so far.

/*
 * This creates the main program frame.
 * Author: Mike Korb
 * November 12, 2012
 */

import javax.swing.JFrame;


public class TrafficLight
{


public static void main (String[] args)
{
	

JFrame frame= new JFrame("Traffic Light");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

TrafficLightPanel panel = new TrafficLightPanel();

frame.getContentPane().add(new TrafficLightPanel());

frame.pack();
frame.setVisible(true);
}
}

TrafficLightPanel

/*
 * This program will change the color of the traffic light when the user hits a radio button corresponding with the color.
 * Author: Mike Korb
 * November 12, 2012
 */


import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;


public class TrafficLightPanel extends JFrame implements ActionListener
{
    
    
    private class Oval extends JPanel
    {
      private Color color;
      
      public Oval(Color color){
          this.color = color;
      }
      
      public void paint(Graphics g) 
      {
         g.setColor(color);
         g.fillOval(0,0, 50,50);
     }
    }
    
    private Oval red    = new Oval(Color.RED);
    private Oval yellow = new Oval(Color.YELLOW);
    private Oval green  = new Oval(Color.GREEN);
    
    private JRadioButton jButtonYellow = new JRadioButton("Yellow");
    private JRadioButton jButtonRed    = new JRadioButton("Red");
    private JRadioButton jButtonGreen  = new JRadioButton("Green");

    public TrafficLightPanel()
        {
         setTitle("Traffic Light");
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setSize(180,200);
         init();
        }

        private void init()
        {
     setContentPane(new JPanel());
     getContentPane().setLayout(new GridLayout(3,2));
     initRadioButtonsAndPanels();
    
     jButtonRed.setSelected(true);
     red.setVisible(true);
        }

        private void initRadioButtonsAndPanels() 
        {

     red.setBackground(Color.RED);
     getContentPane().add(jButtonRed);
     getContentPane().add(red);
     red.setVisible(false);
 
     yellow.setBackground(Color.YELLOW);
     getContentPane().add(jButtonYellow);
     getContentPane().add(yellow);
     yellow.setVisible(false);
    
     green.setBackground(Color.GREEN);
     getContentPane().add(jButtonGreen);
     getContentPane().add(green);
     green.setVisible(false);

     jButtonRed.addActionListener(this);
     jButtonYellow.addActionListener(this);
     jButtonGreen.addActionListener(this);
        }


        public void actionPerformed(ActionEvent event)
        {
    
     if (event.getSource() == jButtonGreen)
     {
         red.setVisible(false);
         yellow.setVisible(false);
         green.setVisible(true);
         }
     else
         if (event.getSource() == jButtonYellow)
         {
             red.setVisible(false);
             yellow.setVisible(true);
             green.setVisible(false);
         }
       else
       {
                 red.setVisible(true);
                 yellow.setVisible(false);
                 green.setVisible(false);
         }
        }

        public static void main(String[] args)
        {
    TrafficLightPanel frame = new TrafficLightPanel();
    frame.setVisible(true);
        }
}

[Michael Dunn]

both have main()
both extend JFrame

you can't add a window/frame to another window/frame:
frame.getContentPane().add(new TrafficLightPanel());