Programming assistance

Question

Hi all,
I need some help hopefully before Sun evening... I have to modify my Inventory program to have an Add, Delete and a search button simple enough.. Well Im new to Java programming and have been limping my way along from day one I have a C+ and need a C- so a little leeway.
Could any one assist me on the easiest way to accomplish the task above even if it is just the search button that I get help with its better then nothing... So My DVDGUI looks like this;
//DVDGUI.java
import java.util.Arrays;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.ImageIcon;
public class DVDGUI extends JFrame
//Private Variables
private GridBagLayout layout = new GridBagLayout();
private GridBagConstraints constraints = new GridBagConstraints();
//Private data from prior assignments
     private DVD [] dvd;
     private int index;
// Labels
private JLabel logoLabel;
private JLabel nameLabel;
private JLabel idLabel;
private JLabel titleLabel;
private JLabel unitsLabel;
private JLabel priceLabel;
private JLabel valueLabel;
private JLabel feeLabel;
private JLabel totalLabel;
// Text Fields for displaying or editing
private JTextField nameText;
private JTextField idText;
private JTextField titleText;
private JTextField unitsText;
private JTextField priceText;
private JTextField valueText;
private JTextField feeText;
private JTextField totalText;
private JTextField searchText;
//Buttons
private JButton firstButton; //To move to first element in the array
private JButton nextButton; //To move to next element in the array
private JButton previousButton; //To again move to next element in the array
private JButton lastButton; //To move again to first element in the array
private JButton addButton; //To add a DVD to array
private JButton deleteButton; //To delete a DVD from array
private JButton modifyButton; //To modify an element
private JButton saveButton; //To save the array
private JButton searchButton; //To search the array
//Constatnts
private final static int LOGO_WIDTH = 4;
private final static int LOGO_HEIGHT = 4;
private final static int LABEL_HEIGHT = 1;
private final static int LABEL_WIDTH = 1;
private final static int TEXT_HEIGHT = 1;
private final static int TEXT_WIDTH = LOGO_WIDTH - LABEL_WIDTH;
private final static int BUTTON_HEIGHT = 1;
private final static int BUTTON_WIDTH = 1;
private final static int LABEL_START_ROW = LOGO_HEIGHT + LABEL_WIDTH + 1;
private final static int LABEL_COLUMN = 0;
private final static int TEXT_START_ROW = LABEL_START_ROW;
private final static int TEXT_COLUMN = LABEL_WIDTH + 1;
private final static int BUTTON_START_ROW = LABEL_START_ROW + 9*LABEL_HEIGHT;
private final static int BUTTON_COLUMN = LABEL_COLUMN;
private final static int SEARCH_START_ROW = BUTTON_START_ROW + 3;
final static String EMPTY_ARRAY_MESSAGE = "Hit ADD to add a new DVD";
//Constants
private final static int FRAME_WIDTH = 325;//460
private final static int FRAME_LENGTH = 350;//343
private final static int FRAME_XLOC = 250;
private final static int FRAME_YLOC = 100;
     //Constructors
//Initialization constructor
     public DVDGUI( DVD dvdIn[] )
     //Pass the frame title to JFrame, set the IconImage
          super( "DVD Inventory" );
setLayout( layout );
//Copy the input array (dvdIn)
          setDVDArray( dvdIn );
//Start the display with the first element of the array
          index = 0;
//Build the GUI
buildGUI();
//Values
updateAllTextFields();
     }//End constructor DVDGUI
//Methods
//Copy an input DVD array to the GUI's private DVD array variable
     private void setDVDArray( DVD dvdIn[] )
          dvd = new DVD[dvdIn.length];
          for(int i = 0;i < dvd.length;i++)
          //Create a DVD array element from the input array
               dvd[i] = new DVD( dvdIn[i] );
/*               dvd[i] = new DVD( dvdIn.title(), dvdIn[i].productNumber(),
               dvdIn[i].productUnitsInStock(), dvdIn[i].productPrice()
//System.out.println( dvdIn[i].toString() );
          }//End for
     }//End copyArray
//A method for updating each of the GUI fields
     private void updateAllTextFields()
if ( dvd.length > 0 ) //Then update the JTextField display
//Update the product name text field
nameText.setText( dvd[index].productName() );
//Update the product id text field
idText.setText( String.format( "%d", dvd[index].productNumber() ) );
     //Update the title text field
          titleText.setText( dvd[index].title() );
//Update the units in stock text field
          unitsText.setText( String.format( "%d", dvd[index].productUnitsInStock() ) );
     //Update the price text field
          priceText.setText( String.format( "$%.2f" , dvd[index].productPrice() ));
//Update the stock value text field
          valueText.setText( String.format( "$%.2f" , dvd[index].productValue() ));
//Update the restocking fee text field
          feeText.setText( String.format( "$%.2f" , dvd[index].restockingFee() ));
//Update the total value text field
          totalText.setText( String.format( "$%.2f" , DVD.productValue( dvd ) ));
}//End if
else //Put a special message in the fields
//Update the product name text field
nameText.setText( EMPTY_ARRAY_MESSAGE );
//Update the product id text field
idText.setText( EMPTY_ARRAY_MESSAGE );
     //Update the title text field
          titleText.setText( EMPTY_ARRAY_MESSAGE );
     //Update the units in stock text field
          unitsText.setText( EMPTY_ARRAY_MESSAGE );
     //Update the price text field
          priceText.setText( EMPTY_ARRAY_MESSAGE );
//Update the stock value text field
          valueText.setText( EMPTY_ARRAY_MESSAGE );
//Update the restocking fee text field
          feeText.setText( EMPTY_ARRAY_MESSAGE );
//Update the total value text field
          totalText.setText( EMPTY_ARRAY_MESSAGE );
}//End else
     }//End updateAllTextFields
//Set the appropriate fields editable or uneditable
private void setModifiableTextFieldsEnabled( Boolean state )
//The DVD ID, title, units in stock, and price can all be set editable or uneditable
idText.setEditable( state );
titleText.setEditable( state );
unitsText.setEditable( state );
priceText.setEditable( state );
}//End setModifiableTextFieldsEnabled
//Button Handler Class - Handling Methods
private class ButtonHandler implements ActionListener
     public void actionPerformed(ActionEvent event)
if( event.getSource() == firstButton ) //First is pressed
          handleFirstButton();
}//End if
else if( event.getSource() == previousButton ) //Previous is pressed
          handlePreviousButton();
}//End else if
else if( event.getSource() == nextButton ) //Next button is pressed
          handleNextButton();
}//End else if
else if( event.getSource() == lastButton ) //Last button is pressed
          handleLastButton();
}//End else if
     else if (event.getSource() == firstButton)
          handleFirstButton();
     }//end else if
}//End method actionPerformed
     }//End class ButtonHandler
//Display the first element of the DVD array
private void handleFirstButton()
     //Set the index to the first element in the array
index = 0;
//Update and disable modification
          updateAllTextFields();
setModifiableTextFieldsEnabled( false );
}//End method handleFirstButton
//Display the next element of the DVD array or wrap to the first
private void handleNextButton()
     //Increment the index
     index++;
//If index exceeds the last valid array element, wrap around to the first element of the array
if ( index > dvd.length - 1 )
index = 0;
}//End if
//Update and disable modification
          updateAllTextFields();
setModifiableTextFieldsEnabled( false );
}//End method handleNextButton
private void handlePreviousButton()
     index--;
     if ( index < 0)
          index = dvd.length - 1;
     }// End if
     //Update and disable modification
          updateAllTextFields();
setModifiableTextFieldsEnabled( false );
}//End method handlePreviousButton
private void handleLastButton()
     index--;
     if ( index < dvd.length - 1 )
          index = 2;
     }//End if
     //Update and disable modification
          updateAllTextFields();
setModifiableTextFieldsEnabled( false );
}//End method handleLastButton
//TextField Handler Class - Handling Methods
//The class for handling the events for the buttons
//NOTE: You don't need this for Week Eight, but I'm including it for motivation on Week
//Nine's assignment
//Hope you dont mind me leaving thin in there
private class TextFieldHandler implements ActionListener
public void actionPerformed( ActionEvent event )
//User pressed Enter in JTextField titleText
if ( event.getSource() == idText )
//handleIdTextField();
}//End if
//User pressed Enter in JTextField titleText
else if ( event.getSource() == titleText )
//handleTitleTextField();
}//End else if
//User pressed Enter in JTextField unitsText
else if ( event.getSource() == unitsText )
//handleUnitsTextField();
}//End else if
//User pressed Enter in JTextField priceText
else if ( event.getSource() == priceText )
//handlePriceTextField();
}//End else if
//User pressed Enter in JTextField searchText
else if ( event.getSource() == searchText )
//handleSearchButtonOrTextField();
}//End else if
}//End method actionPerformed
}//End inner class TextFieldHandler
//GUI Methods
//Build GUI
private void buildGUI()
//Add the logo
buildLogo();
//Add the text fields and their labels
buildLabels();
buildTextFields();
//Add the navigation and other buttons
buildMainButtons();
//Give some values to the fields
updateAllTextFields();
//Set some of the frame properties
          setSize( FRAME_LENGTH , FRAME_WIDTH );
          setLocation( FRAME_XLOC , FRAME_YLOC );
          setResizable( false );
          //pack();
          setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
          setVisible( true );
}//End buildGUI()
//Add the logo to the JFrame
private void buildLogo()
constraints.weightx = 2;
constraints.weighty = 1;
logoLabel = new JLabel( new ImageIcon( "shamrock.jpg" ) );
logoLabel.setText( "Lucky DVDs" );
constraints.fill = GridBagConstraints.BOTH;
addToGridBag( logoLabel, 2, 2, LOGO_WIDTH, LOGO_HEIGHT );
//Create a vertical space
addToGridBag( new JLabel( "" ), LOGO_HEIGHT + 1, 0, LOGO_WIDTH, LABEL_WIDTH );
}//End method buildLogo
//Build just the panel containing the text
private void buildLabels()
//Variables (for readability)
int row = 0;
int column = 0;
int width = 0;
int height = 0;
column = LABEL_COLUMN;
width = LABEL_WIDTH;
height = LABEL_HEIGHT;
constraints.weightx = 1;
constraints.weighty = 0;
constraints.fill = GridBagConstraints.BOTH;
//Create the name label and name text field
nameLabel = new JLabel( "Product: " );
nameLabel.setLabelFor( nameText );
row = LABEL_START_ROW;
addToGridBag( nameLabel, row, column, width, height);
//Create the id label and id text field
idLabel = new JLabel( "Product Id: " );
idLabel.setLabelFor( idText );
row += LABEL_HEIGHT;
addToGridBag( idLabel, row, column, width, height);
//Create the DVD title label and DVD title text field
titleLabel = new JLabel( "Title: " );
titleLabel.setLabelFor( titleText );
row += LABEL_HEIGHT;
addToGridBag( titleLabel, row, column, width, height);
//Create the units in stock label and units in stock text field
          unitsLabel = new JLabel( "Units in Stock: " );
unitsLabel.setLabelFor( unitsText );
row += LABEL_HEIGHT;
addToGridBag( unitsLabel, row, column, width, height);
//Create the price label and price text field
          priceLabel = new JLabel( "Unit Price:" );
priceLabel.setLabelFor( priceText );
row += LABEL_HEIGHT;
addToGridBag( priceLabel, row, column, width, height);
//Create the value label and value text field
          valueLabel = new JLabel( "Product Value:" );
valueLabel.setLabelFor( valueText );
row += LABEL_HEIGHT;
addToGridBag( valueLabel, row, column, width, height);
//Create the fee label and fee text field
          feeLabel = new JLabel( "Restocking fee:" );
feeLabel.setLabelFor( feeText );
row += LABEL_HEIGHT;
addToGridBag( feeLabel, row, column, width, height);
     //Create a vertical space
row += LABEL_HEIGHT;
addToGridBag( new JLabel( "" ), row, column, width, height );
//Create the total value label and total value text field
          totalLabel = new JLabel( "Inventory Value:" );
totalLabel.setLabelFor( totalText );
row += LABEL_HEIGHT;
addToGridBag( totalLabel, row, column, width, height);
}//End method buildLabels()
//Build containing textFields
private void buildTextFields()
//Variables
int row = 0;
int column = 0;
int width = 0;
int height = 0;
column = TEXT_COLUMN;
width = TEXT_WIDTH;
height = TEXT_HEIGHT;
constraints.fill = GridBagConstraints.BOTH;
constraints.weightx = 1;
TextFieldHandler handler = new TextFieldHandler();
nameText = new JTextField( "DVD" );
          nameText.setEditable( false );
row = TEXT_START_ROW;
addToGridBag( nameText, row , column, width, height );
idText = new JTextField( "" );
          idText.setEditable( false );
row += TEXT_HEIGHT;
addToGridBag( idText, row , column, width, height );
titleText = new JTextField( " " );
titleText.addActionListener( handler );
          titleText.setEditable( false );
row += TEXT_HEIGHT;
addToGridBag( titleText, row , column, width, height );
unitsText = new JTextField( " " );
unitsText.addActionListener( handler );
          unitsText.setEditable( false );
row += TEXT_HEIGHT;
addToGridBag( unitsText, row , column, width, height );
priceText = new JTextField( " " );
priceText.addActionListener( handler );
          priceText.setEditable( false );
row += TEXT_HEIGHT;
addToGridBag( priceText, row , column, width, height );
valueText = new JTextField( " " );
          valueText.setEditable( false );
row += TEXT_HEIGHT;
addToGridBag( valueText, row , column, width, height );
feeText = new JTextField( " " );
          feeText.setEditable( false );
row += TEXT_HEIGHT;
addToGridBag( feeText, row , column, width, height );
//Create a vertical space
row += TEXT_HEIGHT;
addToGridBag( new JLabel( " " ), row, column, width, height );
totalText = new JTextField( "" );
          totalText.setEditable( false );
row += TEXT_HEIGHT;
addToGridBag( totalText, row , column, width, height );
}//End method buildTextFields
//Add the main buttons to the frame
private void buildMainButtons()
//Variables
int row = 0;
int column = 0;
int width = 0;
int height = 0;
row = BUTTON_START_ROW;
column = BUTTON_COLUMN;
width = BUTTON_WIDTH;
height = BUTTON_HEIGHT;
constraints.weightx = 1;
constraints.weighty = 0;
//constraints.fill = GridBagConstraints.HORIZONTAL;
ButtonHandler handler = new ButtonHandler();
//Create a vertical space
addToGridBag( new JLabel( "" ), row, 0, LOGO_WIDTH, LABEL_HEIGHT );
firstButton = new JButton( "First" );
firstButton.addActionListener( handler );
row += LABEL_HEIGHT;
addToGridBag( firstButton, row, column, width, height );
previousButton = new JButton( "Previous" );
previousButton.addActionListener( handler );
column += BUTTON_WIDTH;
addToGridBag( previousButton, row, column, width, height );
nextButton = new JButton( "Next" );
nextButton.addActionListener( handler );
column += BUTTON_WIDTH;
addToGridBag( nextButton, row, column, width, height );
lastButton = new JButton( "Last" );
lastButton.addActionListener( handler );
column += BUTTON_WIDTH;
addToGridBag( lastButton, row, column, width, height );
}//End method buildMainButtons
//Add a component to the grid bag
// See Chapter 22, pp 1037 - 1046, Deital & Deital
private void addToGridBag( Component component, int row, int column, int width, int height )
//Set the upper-left corner of the component (gridx, gridy)
constraints.gridx = column;
constraints.gridy = row;
//Set the number of rows and columns the componenet occupies
constraints.gridwidth = width;
constraints.gridheight = height;
//Set the constraints
layout.setConstraints( component, constraints );
//Add the component to the JFrame
add( component );
}//End method addToGridBag
} //End class DVDGUI
Another thing is I have no idea where in this big list of code I need to write more code in order for the buttons to work. I was able to add buttons but they did nothing so I took them out. If anyone can help out that would be fantastic, if not its cool I will just do the best I can and get a second job to repay to take the class again :) No pressure right! Also please know Im not trying to have you all do my work, I just need guidence on where in this mess of text where I need to add more text.
Thanks!
Message was edited by: Me
Greenbeer4me

Answer 1

DvdRental class
public class DvdRental {
     private String title;
     private int units;
     private double price;
     private String advisory;
     public DvdRental(String title, int units, double price
               , String advisory) {
          this.title = title;
          this.units = units;
          this.price = price;
          this.advisory = advisory;
     public void setTitle(String dvdTitle) {
          title = dvdTitle;
     public void setUnits(int dvdUnits) {
          units = dvdUnits;
     public void setPrice(double dvdPrice) {
          price = dvdPrice;
     public void setAdvisory(String dvdAdvisory) {
          advisory = dvdAdvisory;
     public String getTitle() {
          return title;
     public int getUnits() {
          return units;
     public double getPrice() {
          return price;
     public String getAdvisory() {
          return advisory;
}DvdList class
import java.util.*;
import javax.swing.*;
public class DvdList extends AbstractListModel{
     private SortedSet model;
     public DvdList() {
          model = new TreeSet();
     public void add(DvdRental b) {
          model.add(b);
          fireContentsChanged(this,0,getSize());
     public void remove(DvdRental b) {
          model.remove(b);
          fireContentsChanged(this,0,getSize());
     public int getSize() {
          return model.size();
     public Object getElementAt(int index) {
          return model.toArray()[index];
     public void clear() {
          model.clear();
     public boolean contains(Object element) {
          return model.contains(element);
     public DvdRental find(String title) {
          for(DvdRental a : model) {
               if(a.getTitle().equals(title))
                    return a;
          return null;
}Now the swing part is left