Creating a loop for GUI

**ntoxic8** · 12-02-2012, 04:30 AM

I am trying to create a loop for my GUI, but can't seem to figure out how to do the loop so that I can create a array later down the road.
any help would be appreciated.

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

public class RetailGUI extends JFrame
{

// The following variables will reference the
// custom panel objects.
private DepartmentPanel department; // Bagel panel
private ItemPanel item; // Topping panel
private PricePanel price; // Coffee panel
private TitlePanel title; // To display a greeting

// The following variables will reference objects
// needed to add the Calculate and Exit buttons.
private JPanel buttonPanel; // To hold the buttons
private JButton enterButton, // To calculate the cost
printButton,
exitButton; // To exit the application

/**
* Constructor
*/

public RetailGUI()
{

// Display a title.
super("Retail Calculator");

setSize(600, 300);

// Specify an action for the close button.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);

// Create a BorderLayout manager for
// the content pane.
setLayout(new BorderLayout());

// Create the custom panels.
title = new TitlePanel();
department = new DepartmentPanel();
item = new ItemPanel();
price = new PricePanel();

// Call the buildButtonPanel method to
// create the button panel.
buildButtonPanel();

// Add the components to the content pane.
add(title, BorderLayout.NORTH);
add(department, BorderLayout.WEST);
add(item, BorderLayout.CENTER);
add(price, BorderLayout.EAST);
add(buttonPanel, BorderLayout.SOUTH);

// Pack the contents of the window and display it.

pack();
setVisible(true);
}

/**
* The buildButtonPanel method builds the button panel.
*/

private void buildButtonPanel()
{
// Create a panel for the buttons.
buttonPanel = new JPanel();

// Create the buttons.
enterButton = new JButton("Enter");
printButton = new JButton("Print");
exitButton = new JButton("Exit");

// Register the action listeners.
enterButton.addActionListener(new RetailGUI.EnterButtonListener());
printButton.addActionListener(new RetailGUI.PrintButtonListener());
exitButton.addActionListener(new RetailGUI.ExitButtonListener());

// Add the buttons to the button panel.
buttonPanel.add(enterButton);
buttonPanel.add(printButton);
buttonPanel.add(exitButton);
}

/**
* Private inner class that handles the event when
* the user clicks the Calculate button.
*/

private class EnterButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{

new RetailGUI();
}
}

private class PrintButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{

String departmentName,
finalItem;
float priceField,
discountField,
newPrice;

departmentName = department.getDepartmentName();
finalItem = item.getItemName();
priceField = price.getPriceField();
discountField = price.getDiscountField();
newPrice = priceField - (priceField * (discountField/100));

JOptionPane.showMessageDialog(null,"Department: " + departmentName + "\n" +
"Item Name: " + finalItem + "\n" +
"Orginal Price: $" + priceField + "\n" +
"Discount: " + discountField + "%" + "\n" +
"New Price: $" + newPrice + "\n");
}
}

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

**Fubarable** · 12-02-2012, 04:33 AM

Please tell us more details about your current problem as you're leaving a lot up in the air I think. Also please edit your post and add [code] [/code] tags around your posted code. The FAQ's and my links below can help.

**ntoxic8** · 12-02-2012, 04:58 AM

The GUI is for a fake retail store. The employee is supposed to be able to choose the department, enter the item name, the original price, and the discount. The employee should be able to so the any number of items. When the employee is finished they should be able to hit print and a JTable should be displayed. I have tried different spots to place the loop. Also I need an idea on how to clear the fields and place the vaules into the array so that they can start on the next item.

Java Code:

  
   import java.awt.*;
   import java.awt.event.*;
   import javax.swing.*;
  
  public class RetailGUI extends JFrame
   {
      
          

     // The following variables will reference the
      // custom panel objects.
      private DepartmentPanel department;     // Bagel panel
      private ItemPanel item; // Topping panel
      private PricePanel price;    // Coffee panel
      private TitlePanel title;  // To display a greeting
 
      // The following variables will reference objects
      // needed to add the Calculate and Exit buttons.
      private JPanel buttonPanel;    // To hold the buttons
      private JButton enterButton,    // To calculate the cost
                      printButton,
                      exitButton;    // To exit the application
     
 
 
      /**
      * Constructor
       */
 
      public RetailGUI()
      {
        
          
        // Display a title.
         super("Retail Calculator");
         
         
         
         setSize(600, 300);
 
         // Specify an action for the close button.
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setLocationRelativeTo(null);

         // Create a BorderLayout manager for
         // the content pane.
         setLayout(new BorderLayout());
 
        // Create the custom panels.
         title = new TitlePanel();
         department = new DepartmentPanel();
         item = new ItemPanel();
         price = new PricePanel();

         // Call the buildButtonPanel method to
         // create the button panel.
         buildButtonPanel();
 
        // Add the components to the content pane.
         add(title, BorderLayout.NORTH);
         add(department, BorderLayout.WEST);
         add(item, BorderLayout.CENTER);
         add(price, BorderLayout.EAST);
         add(buttonPanel, BorderLayout.SOUTH);
 
         // Pack the contents of the window and display it.
         
         pack();
         setVisible(true);
     }
 
      /**
       * The buildButtonPanel method builds the button panel.
       */

      private void buildButtonPanel()
      {
         // Create a panel for the buttons.
         buttonPanel = new JPanel();

         // Create the buttons.
         enterButton = new JButton("Enter");
         printButton = new JButton("Print");
         exitButton = new JButton("Exit");
 
        // Register the action listeners.
         enterButton.addActionListener(new RetailGUI.EnterButtonListener());
         printButton.addActionListener(new RetailGUI.PrintButtonListener());
         exitButton.addActionListener(new RetailGUI.ExitButtonListener());
 
         // Add the buttons to the button panel.
         buttonPanel.add(enterButton);
         buttonPanel.add(printButton);
         buttonPanel.add(exitButton);
      }
 
      /**
      * Private inner class that handles the event when
       * the user clicks the Calculate button.
       */
 
      
      private class EnterButtonListener implements ActionListener
     {
         public void actionPerformed(ActionEvent e)
         {
           
             new RetailGUI();
        }
     } 

      private class PrintButtonListener implements ActionListener
     {
         public void actionPerformed(ActionEvent e)
         {
           
             String departmentName,
                    finalItem;
             float    priceField,
                      discountField,
                      newPrice;
             
                      
             
             
             

           
            departmentName = department.getDepartmentName();
            finalItem = item.getItemName();
            priceField = price.getPriceField();
            discountField = price.getDiscountField();
            newPrice = priceField - (priceField * (discountField/100));
          
         
                
          
          
           
          
           JOptionPane.showMessageDialog(null,"Department:        " + departmentName + "\n" + 
                                             "Item Name:          " + finalItem + "\n" +
                                              "Orginal Price:     $" + priceField + "\n" +
                                              "Discount:               " + discountField + "%" + "\n" +
                                              "New Price:          $" + newPrice + "\n");
        }
     }      
      
     private class ExitButtonListener implements ActionListener
     {
        public void actionPerformed(ActionEvent e)
       {
           // Exit the application.
           System.exit(0);
        }
     }
}

**Fubarable** · 12-02-2012, 05:36 AM

Thanks for your edits and your clarifications. Let me see if I understand you correctly. Are you thinking that you need a for loop for entering the data? If so, then you're mistaken and likely thinking along the lines of a console program where you must loop to get multiple inputs from the user. What you've got above is a Swing GUI program and it is event-driven, meaning no for loop is needed to get the data, but rather the data is extracted at the control of the user and only occurs when he presses the Enter button. Your current Enter button handler appears to try to create a whole new GUI, and you don't want to do that either. What you will need to do is to get the data to the user, and add it to your data repository, possibly an ArrayList or Vector. Then when the print button is pressed, use the data repository as the nucleus of your JTable's table model. If you hold the data in a Vector, you can simply pass that into the constructor of a DefaultTableModel object along with a Vector<String> for your column names, and if the JTable is constructed with this, the table is done and full of data.

**ntoxic8** · 12-02-2012, 06:18 AM

Ok to how do I clear the textfield once I press enter?

**Fubarable** · 12-02-2012, 06:43 AM

textField.setText("");

would work

**ntoxic8** · 12-02-2012, 08:59 AM

Could I create the ArrayList in this section? If so what would it looke like?

Java Code:

public void actionPerformed(ActionEvent e)
         {
           
             String departmentName,
                    finalItem;
             float    priceField,
                      discountField,
                      newPrice;
             
                      
             
            
           
            departmentName = department.getDepartmentName();
            finalItem = item.getItemName();
            priceField = price.getPriceField();
            discountField = price.getDiscountField();
            newPrice = priceField - (priceField * (discountField/100));
          
         
                
          
          
          
           JOptionPane.showMessageDialog(null,"Department:        " + departmentName + "\n" + 
                                             "Item Name:          " + finalItem + "\n" +
                                              "Orginal Price:     $" + priceField + "\n" +
                                              "Discount:               " + discountField + "%" + "\n" +
                                              "New Price:          $" + newPrice + "\n");
        }