Need help with adding buttons.

Question

I thought I could do this without help but I was wrong. I had to add buttons to my program and before it ran fine with the first four buttons I added but know there are many errors and I believe I messed up the whole thing now. Any advice would be greatly appreciated. Here is my code:
import java.util.*;
import java.text.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JFrame.*;
import java.io.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.imageio.*;
import java.awt.image.*;
public class DVDInventory6
public static void main(String[] args)
       Scanner input = new Scanner( System.in );
       int j;
      DVD_Genre [] inventory = new DVD_Genre[5]; // Size of the array
      // create DVD object
      inventory [ 0 ] = new DVD_Genre( "Rocky", "Action/Drama", 01, 15, 9.95 );
      inventory [ 1 ] = new DVD_Genre( "RockyII", "Action/Drama", 02, 13, 14.95 );
      inventory [ 2 ] = new DVD_Genre( "Matrix", "Action/Sci-Fi", 03, 23, 14.95 );
      inventory [ 3 ] = new DVD_Genre( "MatrixII", "Action/Sci-Fi", 04, 17, 19.95 );
      inventory [ 4 ] = new DVD_Genre( "Bambi", "Family", 05, 33, 12.95 );
      // Print out a screen title
      System.out.println();
      System.out.printf("Welcome to DVD Inventory:\n\n");
   GUI gui = new GUI();
      for(j=0; j<5; ++j)
           gui.add(inventory[j]);   
     double total = 0;
     for ( j=0; j<inventory.length; j++ )
         total += inventory[j].getvalueofdvds ();
} // end for
         gui.setTotal(total);
   gui.display();
public static void sortDVD(DVD[] inventory)
     //DVD_Genre temp[] =  new DVD_Genre[1];
      int i, j;
      for (i=1; i <inventory.length; i++)
         for (j=0; j < inventory.length-i; j++)
            if (inventory[j].getdvdName().compareTo(inventory[j+1].getdvdName())>0)
               // exchange elements
               DVD  temp = inventory[j]; //new DVD_Genre [1];
               inventory[j] = inventory[j+1];
               inventory[j+1] = temp; //temp [0];
   }//end method main
}//end DVDInventory6
      class DVD
      protected String dvdName; //  DVD title
      protected String dvdGenre; // DVD genre
      protected int productnumber;  // DVD product number
      protected int numberofproducts; // the number of products in stock
      protected double price; // the price of the products in stock
        public DVD (String name, String genre, int productnumber, int numberofproducts,
double price ) // class dvd constructor
        this.dvdName = name;
        this.productnumber = productnumber;
        this.numberofproducts = numberofproducts;
        this.price = price;
this.dvdGenre = genre;
       public DVD( String name, int productnumber, int numberofproducts, double price ) //
class dvd constructor
        this.dvdName = name;
        this.productnumber = productnumber;
        this.numberofproducts = numberofproducts;
        this.price = price;
      public void setdvdName( String name ) // method to set dvd name
      this.dvdName = name; // store the dvd name
      public String getdvdName()// method to get dvd name
      return dvdName;
      public void setproductnumber( int productnumber )  // method to set productnumber
      this.productnumber = productnumber; // store productnumber
      public int getproductnumber()// method to get productnumber
      return productnumber;
      public void setnumberofproducts( int numberofproducts )// method to set
numberofproducts
      this.numberofproducts = numberofproducts; // store numberofproducts
      public int getnumberofproducts()// method to get numberofproducts
      return numberofproducts;
      public void setprice( double price )// method to set price
      this.price = price; // price of the products in stock
      public double getprice()// method to get price
      return price;
      public double getvalueofdvds()// method to get valueofdvds
      return numberofproducts * price;
} // end class DVD
class DVD_Genre extends DVD
         private String genre; // genre of DVD
  private double restockingFee; // percentage added to inventory value
   //constructor
public DVD_Genre(String name, String genre, int productnumber, int numberofproducts, double
price)
   super(name, genre, productnumber, numberofproducts, price);
  this.genre = genre;
                this.restockingFee = restockingFee;
      public void setdvdGenre( String genre ) // method to set dvd genre
      this.dvdGenre = genre; // store the dvd genre
      public String getdvdGenre()// method to get dvd genre
      return dvdGenre;     
// Calculates restocking fee based on previous data.
    public double restockFee() {
     double total = 0;
     double restock = 0;
     total = numberofproducts * price;
     restock = total * .05;
            return restock;
    public String toString()
   DecimalFormat Currency = new DecimalFormat("$0.00");
   return "\nDVD Title: " +  dvdName + "\nDVD Genre: " +  dvdGenre + "\nProduct number: " +
productnumber +
          "\nNumber of products: " + numberofproducts + "\nPrice: " + price + "\nValue of
DVD's: " +  Currency.format(numberofproducts * price) + "\nRestock Fee: "  +
Currency.format(numberofproducts * price * .05);
}// End class DVD_Genre
class GUI {
private DVD[] dvds;
    private int nCount;
private double total;
// Creates array DVD[]
    GUI() {
        dvds = new DVD[5];
        nCount = 0;
    public void add(DVD dvd) {
        dvds[nCount] = dvd;
        ++nCount;
public void setTotal(double total)
  this.total = total;
    DecimalFormat Currency = new DecimalFormat("$0.00");
//Displays the arrays contents element by element into a GUI pane
       public void display() {
  GUIDisplay(dvds, 5);
public void GUIDisplay(DVD[] products, int numOfProducts)
          PanelFrame frame = new PanelFrame(products, numOfProducts);
          frame.pack();
          frame.setVisible(true);
          frame.setSize(600, 450);
} // end class GUI
        class PanelFrame extends JFrame
        private JButton first;
        private JButton next;
        private JButton previous;
        private JButton last;
        private JButton add;
        private JButton delete;
        private JButton modify;
        private JButton search;
        private JButton save;
        JTextField dvdName;
        JTextField productnumber;
        JTextField numberofproducts;
        JTextField price;
        private DVD[] products;
        private int numOfProducts;
        private int currentIndex = 0;
/** Creates a new instance of PanelFrame */
  public PanelFrame(DVD[] products, int numOfProducts)
        super("Welcome to the DVD Inventory");
        this.products = products;
        this.numOfProducts = numOfProducts;
        setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        setLayout(new GridLayout(6,1,5,5));
        showLogo();
        showLabels();
        showInputFields();
        showButtons();
public class MovieGraphics extends Component
        private BufferedImage image;
        private boolean imageFound = true;
  public MovieGraphics()
       super();
   try
       image = ImageIO.read(new File("logo.jpg"));
  catch (IOException x)
      x.printStackTrace();
      imageFound = false;
  public void paint(Graphics g)
  if (imageFound)
     g.drawImage(image,
     0, 0, 200, 100,
     0, 0, image.getWidth(null), image.getHeight(null),
null);
  else
     g.drawString("Gary's DVD Krypt", 30, 30);
} // end of class MovieGraphics
  public void showLogo()
        MovieGraphics myLogo = new MovieGraphics();
        this.add(myLogo);
  public void showLabels()
        JPanel panel = new JPanel();
        panel.add(new JLabel("DVD Title"));
        panel.add(new JLabel("Product number"));
        panel.add(new JLabel("Number of products"));
        panel.add(new JLabel("Price"));
        this.add(panel);
  public void showInputFields()
        JPanel panel = new JPanel();
        dvdName = new JTextField(10);
        productnumber = new JTextField(10);
        numberofproducts = new JTextField(10);
        price = new JTextField(10);
        dvdName.setEditable(false);
        productnumber .setEditable(false);
        numberofproducts.setEditable(false);
        price.setEditable(false);
        panel.add(dvdName);
        panel.add(productnumber );
        panel.add(numberofproducts);
        panel.add(price);
    this.add(panel);
  public void showButtons()
        JPanel panel = new JPanel();
        first = new JButton("First");
        next = new JButton("Next");
        previous = new JButton("Previous");
        last = new JButton("Last");
        add = new JButton("Add");
        delete = new JButton("Delete");
        modify = new JButton("Modify");
        search = new JButton("Search");
        save = new JButton("Save");
        panel.add(first);
        panel.add(next);
        panel.add(previous);
        panel.add(last);
        panel.add(add);
        panel.add(delete);
        panel.add(modify);
        panel.add(search);
        panel.add(save);
        ButtonActionHandler handler = new ButtonActionHandler();
          first.addActionListener(handler);
          next.addActionListener(handler);
          previous.addActionListener(handler);
          last.addActionListener(handler);
          add.addActionListener(handler);
          delete.addActionListener(handler);
          modify.addActionListener(handler);
          search.addActionListener(handler);
          save.addActionListener(handler);
          this.add(panel);
          setFields(0);
  protected void paintComponent(Graphics g)
  public void setFields(int i)
     setdvdName(i);
     setproductnumber(i);
     setnumberofproducts(i);
     setPrice(i);
  public void setdvdName(int i)
  dvdName.setText(products.getdvdName());
public void setproductnumber(int i)
productnumber.setText(String.valueOf(products[i].getproductnumber()));
public void setnumberofproducts(int i)
numberofproducts.setText(String.valueOf(products[i].getnumberofproducts()));
public void setPrice(int i)
price.setText(String.valueOf(products[i].getprice()));
private class ButtonActionHandler implements ActionListener
public void actionPerformed(ActionEvent event)
if (event.getSource() == first)
addClicked = false;
currentIndex = 0;
setFields(currentIndex);
makeFieldsEditable(false);
else if (event.getSource() == next)
addClicked = false;
currentIndex++;
if (currentIndex == numOfProducts)
currentIndex --;
setFields(currentIndex);
makeFieldsEditable(false);
else if (event.getSource() == previous)
addClicked = false;
currentIndex--;
if (currentIndex < 0)
currentIndex = 0;
setFields(currentIndex);
makeFieldsEditable(false);
else if (event.getSource() == last)
addClicked = false;
currentIndex = numOfProducts - 1;
if (currentIndex < 0)
currentIndex = 0;
setFields(currentIndex);
makeFieldsEditable(false);
else if(event.getSource() ==add)
//add actions for add here
if (!addClicked)
resetFields();
makeFieldsEditable(true);
int itemNum = incrementItemNumber();
System.out.println(itemNum);
itemNumber.setText(String.valueOf(itemNum));
currentIndex = numOfProducts;
addClicked = true;
else if(event.getSource() ==save)
//add actions for save here
//we need to call SaveToFile.java
// SaveToFile.save;
addClicked = false;
System.out.println(currentIndex);
if (!updateProduct(currentIndex))
JOptionPane.showMessageDialog(null, "You have reached maximum number of products!");
currentIndex --;
setFields(currentIndex);
else
saveProduct();
makeFieldsEditable(false);
else if(event.getSource() == edit)
//add actions for edit here
// Inventory.edit;
addClicked = false;
makeFieldsEditable(true);
else if(event.getSource() == search)
//add actions for search here
// Inventory.findIndex;
addClicked = false;
String name = JOptionPane.showInputDialog("Enter Product Name: ");
int index = searchName(name);
System.out.println(index);
if (index == -1)
JOptionPane.showMessageDialog(null, "No matching product found! ");
else
currentIndex = index;
setFields(index);
Here are my errors:
C:\java>javac DVDInventory6.java
DVDInventory6.java:460: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
addClicked = false;
^
DVDInventory6.java:463: cannot find symbol
symbol : method makeFieldsEditable(boolean)
location: class PanelFrame.ButtonActionHandler
makeFieldsEditable(false);
^
DVDInventory6.java:467: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
addClicked = false;
^
DVDInventory6.java:474: cannot find symbol
symbol : method makeFieldsEditable(boolean)
location: class PanelFrame.ButtonActionHandler
makeFieldsEditable(false);
^
DVDInventory6.java:478: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
addClicked = false;
^
DVDInventory6.java:485: cannot find symbol
symbol : method makeFieldsEditable(boolean)
location: class PanelFrame.ButtonActionHandler
makeFieldsEditable(false);
^
DVDInventory6.java:489: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
addClicked = false;
^
DVDInventory6.java:496: cannot find symbol
symbol : method makeFieldsEditable(boolean)
location: class PanelFrame.ButtonActionHandler
makeFieldsEditable(false);
^
DVDInventory6.java:501: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
if (!addClicked)
^
DVDInventory6.java:503: cannot find symbol
symbol : method resetFields()
location: class PanelFrame.ButtonActionHandler
resetFields();
^
DVDInventory6.java:504: cannot find symbol
symbol : method makeFieldsEditable(boolean)
location: class PanelFrame.ButtonActionHandler
makeFieldsEditable(true);
^
DVDInventory6.java:505: cannot find symbol
symbol : method incrementItemNumber()
location: class PanelFrame.ButtonActionHandler
int itemNum = incrementItemNumber();
^
DVDInventory6.java:507: cannot find symbol
symbol : variable itemNumber
location: class PanelFrame.ButtonActionHandler
itemNumber.setText(String.valueOf(itemNum));
^
DVDInventory6.java:510: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
addClicked = true;
^
DVDInventory6.java:517: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
addClicked = false;
^
DVDInventory6.java:519: cannot find symbol
symbol : method updateProduct(int)
location: class PanelFrame.ButtonActionHandler
if (!updateProduct(currentIndex))
^
DVDInventory6.java:527: cannot find symbol
symbol : method saveProduct()
location: class PanelFrame.ButtonActionHandler
saveProduct();
^
DVDInventory6.java:529: cannot find symbol
symbol : method makeFieldsEditable(boolean)
location: class PanelFrame.ButtonActionHandler
makeFieldsEditable(false);
^
DVDInventory6.java:531: cannot find symbol
symbol : variable edit
location: class PanelFrame.ButtonActionHandler
else if(event.getSource() == edit)
^
DVDInventory6.java:535: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
addClicked = false;
^
DVDInventory6.java:536: cannot find symbol
symbol : method makeFieldsEditable(boolean)
location: class PanelFrame.ButtonActionHandler
makeFieldsEditable(true);
^
DVDInventory6.java:542: cannot find symbol
symbol : variable addClicked
location: class PanelFrame.ButtonActionHandler
addClicked = false;
^
DVDInventory6.java:544: cannot find symbol
symbol : method searchName(java.lang.String)
location: class PanelFrame.ButtonActionHandler
int index = searchName(name);
^
23 errors

Answer 1

and many more errors
such as;
* you need to declare a method called makeFieldsEditable that takes a boolean value
eg private void makeFieldsEditable(boolean editable){
   // add your implememntation
}* you need to declare a method called resetFields
eg private void resetFields(){
   // add your implememntation
}* you need to declare a method called updateProduct
eg private void updateProduct(int index){
   // add your implememntation
}etc