import javax.swing.JOptionPane;
import java.awt.FlowLayout; // specifies how components are arranged
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame; // provides basic window features
import javax.swing.JLabel; // displays text and images
import javax.swing.SwingConstants;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.Box;



public class GUI extends JFrame implements ActionListener
{

private JLabel label2; // JLabel Item number
private JLabel label3; // JLabel Title of Movie
private JLabel label4; // JLabel Movie Rating
private JLabel label5; // JLabel Stock Number
private JLabel label6; // JLabel Number of Item in Stock
private JLabel label7; // JLabel Restocking Fee
private JLabel label8; // JLabel Purchase Price
private JLabel label9; // JLabel Inventory Value
private JLabel label10; // JLabel Total Inventory Value
private JTextField jtfItem;
private JTextField jtfVideo; //1
private JTextField jtfRating; //2
private JTextField jtfitmNumber; //3
private JTextField jtfStock;//4
private JTextField jtfReStock; //5   getrestock()
private JTextField jtfPrice; //6
private JTextField jtfValue;   //7   getresult()
private JTextField jtftotalInv;//8
private JLabel label11; //JLabel icon
private JButton btnFirst;
private JButton btnPrevious;
private JButton btnNext;
private JButton btnLast;
private JButton    btnAdd;
private JButton btnDelete;
private JButton btnModify;
private JButton btnSave;
private JButton btnSearch;
private JButton btnLoadfile;
DVD[] dvd;
int index = 0;

// LabelFrame constructor adds JLabels to JFrame
public GUI()
{
super( "Inventory of DVD Movies" );
// JLabel constructor with a string argument
  //this.inventory1 = inventory1;


    JLabel jl;
    JPanel jp;

setLayout( new FlowLayout() ); // set frame layout




label2 = new JLabel("Item#: " );
label2.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfItem = new JTextField (30);
jtfItem.setEditable(false);
add( label2 ); // add label2 to JFrame
add(jtfItem);

label3 = new JLabel( "Title of Movie: ");
label3.setHorizontalTextPosition( SwingConstants.RIGHT );
label2.setVerticalTextPosition( SwingConstants.CENTER );
jtfVideo = new JTextField (30);
jtfVideo.setEditable(false);
add( label3 ); // add label2 to JFrame
add(jtfVideo);


label4 = new JLabel("Movie Rating:");
label4.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfRating = new JTextField (30);
jtfRating.setEditable(false);
add( label4 ); // add label2 to JFrame
add(jtfRating);

label5 = new JLabel("Item Number:");
label5.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfitmNumber = new JTextField (30);
jtfitmNumber.setEditable(false);
add( label5 ); // add label2 to JFrame
add(jtfitmNumber);

label6 = new JLabel( "# of Items in Stock:");
label6.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfStock = new JTextField (30);
jtfStock.setEditable(false);
add( label6 ); // add label2 to JFrame
add(jtfStock);

label7 = new JLabel( "Restocking Fee:" );
label7.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfReStock = new JTextField (30);
jtfReStock.setEditable(false);
add( label7 ); // add label2 to JFrame
add(jtfReStock);

label8 = new JLabel( "Purchase Price:");
label8.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfPrice = new JTextField (30);
jtfPrice.setEditable(false);
add( label8 ); // add label2 to JFrame
add(jtfPrice);

label9 = new JLabel( "Inventory Value:");
label9.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfValue = new JTextField (30);
jtfValue.setEditable(false);
add( label9 ); // add label2 to JFrame
add(jtfValue);

label10 = new JLabel( "Total Inventory Value:\n");
label10.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtftotalInv = new JTextField (30);
jtftotalInv.setEditable(false);
add( label10 ); // add label2 to JFrame
add(jtftotalInv);

Icon dvd = new ImageIcon(getClass().getResource( "dvd.jpg" ));
label11 = new JLabel ( dvd, SwingConstants.LEFT);
label11.setVerticalTextPosition( SwingConstants.TOP);
add( label11 );

btnFirst = new JButton( "First" );
btnFirst.addActionListener(this);
add( btnFirst );


btnPrevious = new JButton( "Previous" );
btnPrevious.addActionListener(this);
add( btnPrevious );

btnNext = new JButton( "Next" );
btnNext.addActionListener(this);
add( btnNext );

btnLast = new JButton( "Last" );
btnLast.addActionListener(this);
add( btnLast );

btnAdd = new JButton( "Add" );
btnAdd.addActionListener(this);
add( btnAdd );

btnDelete = new JButton( "Delete" );
btnDelete.addActionListener(this);
add( btnDelete );

btnModify = new JButton( "Modify" );
btnModify.addActionListener(this);
add( btnModify );

btnSave = new JButton( "Save" );
btnSave.addActionListener(this);
add( btnSave );

btnSearch = new JButton( "Search" );
btnSearch.addActionListener(this);
add( btnSearch );

btnLoadfile = new JButton( "Load file" );
btnLoadfile.addActionListener(this);
add( btnLoadfile );



setSize(800,500);
     setVisible(true);



} // end LabelFrame constructor


void setDVD(DVD[] dvd)
{
    this.dvd = dvd;
    index = 0;
    display();
}
void display() {
    jtfItem.setText("" + dvd[index].getItems());
        jtfVideo.setText("" + dvd[index].getVideo());
               jtfRating.setText("" + dvd[index].getRating());
               jtfitmNumber.setText("" + dvd[index].getNumber());
               jtfStock.setText("" + dvd[index].getStock());
               jtfReStock.setText("" + dvd[index].getRestockingFee());
               jtfPrice.setText("" + dvd[index].getPrice());
               jtfValue.setText("" + dvd[index].getValue());
               jtftotalInv.setText("" + dvd[index].CalculateTotalInventoryValue());
}
// to display next movie
void displayFirst(){
        index = 0;
        display();
    }
    void displayNext() {
          index++;
          if(index >= dvd.length )   // wrap around
            index = 0;
          display();
    }
    // display previous
        void displayPrevious() {
            index--;
            if(index < 0)                    // wrap around
              index = dvd.length - 1;
        display();
    }



    void displayLast(){
            index = dvd.length - 1;
            display();
        }

public void actionPerformed(ActionEvent e){
    Object buttonPressed = e.getSource();
    if(buttonPressed == btnFirst){
        index = 0;
        displayFirst();
        return;
    }
    if (buttonPressed == btnNext) {
        displayNext();
        return;
    }
    if (buttonPressed == btnPrevious){
        displayPrevious();
        return;
    }
    if (buttonPressed == btnLast){
        displayLast();
        return;
    }
    display();
}

} // end class GUI

import java.lang.String;
import java.text.DecimalFormat;
import java.awt.FlowLayout; // specifies how components are arranged
import javax.swing.JFrame; // provides basic window features
import javax.swing.JLabel; // displays text and images
import javax.swing.JTextField;


public class Inventory1Test
{
static DecimalFormat formatter = new DecimalFormat("$##,###.00");



    public static void main( String args[] )
    {

        DVD[] library = new DVD[4];

        library[0] = new DVD( "1", "Star Wars", "PG", 232, 5, 13.45);
        library[1] = new DVD("2", "Cars", "G", 233, 7, 12.23 );
        library[2] = new DVD("3", "Fantastic Four", "PG", 234, 8, 18.45);
        library[3] = new DVD("4", "Batman", "PG-13", 235, 2, 10.88);

GUI gui = new GUI();
gui.setDVD(library);





Double totalInv = library[0].CalculateTotalInventoryValue(library);


//Double restockingFee = library[index].getRestockingFee();

//System.out.printf( "Restocking Fee(5%): \t%s\n\n", library[index].getRestockingFee());







}//end main



}//end class Inventory1Test

import javax.swing.JOptionPane;
import java.awt.FlowLayout; // specifies how components are arranged
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame; // provides basic window features
import javax.swing.JLabel; // displays text and images
import javax.swing.SwingConstants;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.Box;



public class GUI extends JFrame implements ActionListener
{

private JLabel label2; // JLabel Item number
private JLabel label3; // JLabel Title of Movie
private JLabel label4; // JLabel Movie Rating
private JLabel label5; // JLabel Stock Number
private JLabel label6; // JLabel Number of Item in Stock
private JLabel label7; // JLabel Restocking Fee
private JLabel label8; // JLabel Purchase Price
private JLabel label9; // JLabel Inventory Value
private JLabel label10; // JLabel Total Inventory Value
private JTextField jtfItem;
private JTextField jtfVideo; //1
private JTextField jtfRating; //2
private JTextField jtfitmNumber; //3
private JTextField jtfStock;//4
private JTextField jtfReStock; //5   getrestock()
private JTextField jtfPrice; //6
private JTextField jtfValue;   //7   getresult()
private JTextField jtftotalInv;//8
private JLabel label11; //JLabel icon
private JButton btnFirst;
private JButton btnPrevious;
private JButton btnNext;
private JButton btnLast;
private JButton    btnAdd;
private JButton btnDelete;
private JButton btnModify;
private JButton btnSave;
private JButton btnSearch;
private JButton btnLoadfile;
DVD[] dvd;
int index = 0;

// LabelFrame constructor adds JLabels to JFrame
public GUI()
{
super( "Inventory of DVD Movies" );
// JLabel constructor with a string argument
  //this.inventory1 = inventory1;


    JLabel jl;
    JPanel jp;

setLayout( new FlowLayout() ); // set frame layout




label2 = new JLabel("Item#: " );
label2.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfItem = new JTextField (10);
jtfItem.setEditable(false);
add( label2 ); // add label2 to JFrame
add(jtfItem);

label3 = new JLabel( "Title of Movie: ");
label3.setHorizontalTextPosition( SwingConstants.RIGHT );
label2.setVerticalTextPosition( SwingConstants.CENTER );
jtfVideo = new JTextField (30);
jtfVideo.setEditable(false);
add( label3 ); // add label2 to JFrame
add(jtfVideo);


label4 = new JLabel("Movie Rating:");
label4.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfRating = new JTextField (5);
jtfRating.setEditable(false);
add( label4 ); // add label2 to JFrame
add(jtfRating);

label5 = new JLabel("Item Number:");
label5.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfitmNumber = new JTextField (20);
jtfitmNumber.setEditable(false);
add( label5 ); // add label2 to JFrame
add(jtfitmNumber);

label6 = new JLabel( "# of Items in Stock:");
label6.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfStock = new JTextField (10);
jtfStock.setEditable(false);
add( label6 ); // add label2 to JFrame
add(jtfStock);

label7 = new JLabel( "Restocking Fee:" );
label7.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfReStock = new JTextField (10);
jtfReStock.setEditable(false);
add( label7 ); // add label2 to JFrame
add(jtfReStock);

label8 = new JLabel( "Purchase Price:");
label8.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfPrice = new JTextField (10);
jtfPrice.setEditable(false);
add( label8 ); // add label2 to JFrame
add(jtfPrice);

label9 = new JLabel( "Inventory Value:");
label9.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfValue = new JTextField (10);
jtfValue.setEditable(false);
add( label9 ); // add label2 to JFrame
add(jtfValue);

label10 = new JLabel( "Total Inventory Value:\n");
label10.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtftotalInv = new JTextField (10);
jtftotalInv.setEditable(false);
add( label10 ); // add label2 to JFrame
add(jtftotalInv);

Icon dvd = new ImageIcon(getClass().getResource( "dvd.jpg" ));
label11 = new JLabel ( dvd, SwingConstants.LEFT);
label11.setVerticalTextPosition( SwingConstants.TOP);
add( label11 );

btnFirst = new JButton( "First" );
btnFirst.addActionListener(this);
add( btnFirst );


btnPrevious = new JButton( "Previous" );
btnPrevious.addActionListener(this);
add( btnPrevious );

btnNext = new JButton( "Next" );
btnNext.addActionListener(this);
add( btnNext );

btnLast = new JButton( "Last" );
btnLast.addActionListener(this);
add( btnLast );

btnAdd = new JButton( "Add" );
btnAdd.addActionListener(this);
add( btnAdd );

btnDelete = new JButton( "Delete" );
btnDelete.addActionListener(this);
add( btnDelete );

btnModify = new JButton( "Modify" );
btnModify.addActionListener(this);
add( btnModify );

btnSave = new JButton( "Save" );
btnSave.addActionListener(this);
add( btnSave );

btnSearch = new JButton( "Search" );
btnSearch.addActionListener(this);
add( btnSearch );

btnLoadfile = new JButton( "Load file" );
btnLoadfile.addActionListener(this);
add( btnLoadfile );



setSize(800,500);
     setVisible(true);



} // end LabelFrame constructor


void setDVD(DVD[] dvd)
{
    this.dvd = dvd;
    index = 0;
    display();
}
void display() {
    jtfItem.setText("" + dvd[index].getItems());
        jtfVideo.setText("" + dvd[index].getVideo());
               jtfRating.setText("" + dvd[index].getRating());
               jtfitmNumber.setText("" + dvd[index].getNumber());
               jtfStock.setText("" + dvd[index].getStock());
               jtfReStock.setText("" + dvd[index].getRestockingFee());
               jtfPrice.setText("" + dvd[index].getPrice());
               jtfValue.setText("" + dvd[index].getValue());
               jtftotalInv.setText("" + dvd[index].CalculateTotalInventoryValue(dvd));
}
// to display next movie
void displayFirst(){
        index = 0;
        display();
    }
    void displayNext() {
          index++;
          if(index >= dvd.length )   // wrap around
            index = 0;
          display();
    }
    // display previous
        void displayPrevious() {
            index--;
            if(index < 0)                    // wrap around
              index = dvd.length - 1;
        display();
    }

    void displayLast(){
            index = dvd.length - 1;
            display();
        }


public void actionPerformed(ActionEvent e){
    Object buttonPressed = e.getSource();
    if(buttonPressed == btnFirst){
        index = 0;
        displayFirst();
        return;
    }
    if (buttonPressed == btnNext) {
        displayNext();
        return;
    }
    if (buttonPressed == btnPrevious){
        displayPrevious();
        return;
    }
    if (buttonPressed == btnLast){
        displayLast();
        return;
    }
    display();
}

} // end class GUI

public class DVD extends Inventory1 {
    // Holds the rating of the movie
    private String movierating;
    private String items;
    private String video;
    private int number;
    private int stock;
    private double price;

    private double value;


    public DVD( String items, String  video, String rating, int number,  int stock, double price )
    {
        super( items, video, number, stock, price );
       movierating = rating;

    }
    public String getRating() {
            return movierating;
        }

// Simply gets the base class's value, and figures out the 5% restocking fee only
        public double getRestockingFee() {
//      return super.getValue() * .05;
            return getPrice()*0.05;
    }

public double getValue()
{
    return(getPrice()*getStock()*1.05);
}//end method getValue



}//end class DVD

//inventory part 1
import java.lang.String;

public class Inventory1
{
    protected String items;
    protected String video;
    protected int number;
    protected int stock;
    protected double price;
    protected double value;

    public Inventory1( String i, String v, int n, int s, double p )
    {
        setItems(i);
        setVideo(v);
        setNumber(n);
        setStock(s);
        setPrice(p);
    }//end Inventory1 five-argument constructor

    public Inventory1( Inventory1 inventory)
    {
        this( inventory.getItems(), inventory.getVideo(), inventory.getNumber(), inventory.getStock(), inventory.getPrice() );
    }//end Inventoryconstructor with a Inventory object argument


    public void setInventory1( String i, String v, int n, int s, double p )
    {
        setItems( i );
        setVideo( v );
        setNumber( n );
        setStock( s );
        setPrice( p );
    }//end method setInventory

    public void setItems( String i )
    {
        items = ( i );
    }//end method setItems

    public void setVideo( String v )
    {
        video = ( v );
    }//end method setVideo

    public void setNumber( int n )
    {
        number = ( n );
    }//end method setNumber

    public void setStock( int s )
    {
        stock = ( s );
    }//end method setStock

    public void setPrice(double p )
    {
        price = ( p );
    }//end method setPrice

    public String getItems()
    {
        return items;
    }//end method getItems

    public String getVideo()
    {
        return video;
    }//end method getVideo

    public int getNumber()
    {
        return number;
    }//end method getNumber

    public int getStock()
    {
        return stock;
    }//end method getStock

    public double getPrice()
    {
        return price;
    }//end method getPrice

    public double getValue()
    {
        return (stock * price);
        }//end method getValue

public Double CalculateTotalInventoryValue(Inventory1[] product)
{
  Double total = 0.0;
  for(int index = 0; index < product.length; index++)
  {
   Inventory1 inv = product[index];
   total += inv.getValue();
  }

  return total;
}



public Inventory1[] SortInventory1 (Inventory1[] theInventory1)
{
  Inventory1 tmp;

for (int index = 0; index < theInventory1.length; index++)
  {
   for (int anotherindex = index + 1; anotherindex< theInventory1.length; anotherindex++)
   {
    String s1 = theInventory1[index].getVideo();
    String s2 = theInventory1[anotherindex].getVideo();
    if( s1.compareTo(s2) > 0)
    {
     tmp = theInventory1[index];
     theInventory1 [index] = theInventory1[anotherindex];
     theInventory1 [anotherindex] = tmp;
    }
   }
  }
return theInventory1;
}








}//end class Inventory1

void setDVD(DVD[] dvd)
{
    this.dvd = dvd;
    index = 0;
    display();      // <------------------------------
}

import javax.swing.JOptionPane;
import java.awt.FlowLayout; // specifies how components are arranged
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame; // provides basic window features
import javax.swing.JLabel; // displays text and images
import javax.swing.SwingConstants;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.Box;



public class GUI extends JFrame implements ActionListener
{

private JLabel label2; // JLabel Item number
private JLabel label3; // JLabel Title of Movie
private JLabel label4; // JLabel Movie Rating
private JLabel label5; // JLabel Stock Number
private JLabel label6; // JLabel Number of Item in Stock
private JLabel label7; // JLabel Restocking Fee
private JLabel label8; // JLabel Purchase Price
private JLabel label9; // JLabel Inventory Value
private JLabel label10; // JLabel Total Inventory Value
private JTextField jtfItem;
private JTextField jtfVideo; //1
private JTextField jtfRating; //2
private JTextField jtfitmNumber; //3
private JTextField jtfStock;//4
private JTextField jtfReStock; //5   getrestock()
private JTextField jtfPrice; //6
private JTextField jtfValue;   //7   getresult()
private JTextField jtftotalInv;//8
private JLabel label11; //JLabel icon
private JButton btnFirst;
private JButton btnPrevious;
private JButton btnNext;
private JButton btnLast;
private JButton    btnAdd;
private JButton btnDelete;
private JButton btnModify;
private JButton btnSave;
private JButton btnSearch;
private JButton btnLoadfile;
DVD[] dvd;
int index = 0;

// LabelFrame constructor adds JLabels to JFrame
public GUI()
{
super( "Inventory of DVD Movies" );
// JLabel constructor with a string argument
  //this.inventory1 = inventory1;


    JLabel jl;
    JPanel jp;

setLayout( new FlowLayout() ); // set frame layout




label2 = new JLabel("Item#: " );
label2.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfItem = new JTextField (10);
jtfItem.setEditable(false);
add( label2 ); // add label2 to JFrame
add(jtfItem);

label3 = new JLabel( "Title of Movie: ");
label3.setHorizontalTextPosition( SwingConstants.RIGHT );
label2.setVerticalTextPosition( SwingConstants.CENTER );
jtfVideo = new JTextField (30);
jtfVideo.setEditable(false);
add( label3 ); // add label2 to JFrame
add(jtfVideo);


label4 = new JLabel("Movie Rating:");
label4.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfRating = new JTextField (5);
jtfRating.setEditable(false);
add( label4 ); // add label2 to JFrame
add(jtfRating);

label5 = new JLabel("Item Number:");
label5.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfitmNumber = new JTextField (20);
jtfitmNumber.setEditable(false);
add( label5 ); // add label2 to JFrame
add(jtfitmNumber);

label6 = new JLabel( "# of Items in Stock:");
label6.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfStock = new JTextField (10);
jtfStock.setEditable(false);
add( label6 ); // add label2 to JFrame
add(jtfStock);

label7 = new JLabel( "Restocking Fee:" );
label7.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfReStock = new JTextField (10);
jtfReStock.setEditable(false);
add( label7 ); // add label2 to JFrame
add(jtfReStock);

label8 = new JLabel( "Purchase Price:");
label8.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfPrice = new JTextField (10);
jtfPrice.setEditable(false);
add( label8 ); // add label2 to JFrame
add(jtfPrice);

label9 = new JLabel( "Inventory Value:");
label9.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtfValue = new JTextField (10);
jtfValue.setEditable(false);
add( label9 ); // add label2 to JFrame
add(jtfValue);

label10 = new JLabel( "Total Inventory Value:\n");
label10.setHorizontalTextPosition( SwingConstants.LEFT );
label2.setVerticalTextPosition( SwingConstants.TOP );
jtftotalInv = new JTextField (10);
jtftotalInv.setEditable(false);
add( label10 ); // add label2 to JFrame
add(jtftotalInv);

Icon dvd = new ImageIcon(getClass().getResource( "dvd.jpg" ));
label11 = new JLabel ( dvd, SwingConstants.LEFT);
label11.setVerticalTextPosition( SwingConstants.TOP);
add( label11 );

btnFirst = new JButton( "First" );
btnFirst.addActionListener(this);
add( btnFirst );


btnPrevious = new JButton( "Previous" );
btnPrevious.addActionListener(this);
add( btnPrevious );

btnNext = new JButton( "Next" );
btnNext.addActionListener(this);
add( btnNext );

btnLast = new JButton( "Last" );
btnLast.addActionListener(this);
add( btnLast );

btnAdd = new JButton( "Add" );
btnAdd.addActionListener(this);
add( btnAdd );

btnDelete = new JButton( "Delete" );
btnDelete.addActionListener(this);
add( btnDelete );

btnModify = new JButton( "Modify" );
btnModify.addActionListener(this);
add( btnModify );

btnSave = new JButton( "Save" );
btnSave.addActionListener(this);
add( btnSave );

btnSearch = new JButton( "Search" );
btnSearch.addActionListener(this);
add( btnSearch );

btnLoadfile = new JButton( "Load file" );
btnLoadfile.addActionListener(this);
add( btnLoadfile );



setSize(800,500);
     setVisible(true);



} // end LabelFrame constructor


void setDVD(DVD[] dvd)
{
    this.dvd = dvd;
    index = 0;

}
void display() {
    jtfItem.setText("" + dvd[index].getItems());
        jtfVideo.setText("" + dvd[index].getVideo());
               jtfRating.setText("" + dvd[index].getRating());
               jtfitmNumber.setText("" + dvd[index].getNumber());
               jtfStock.setText("" + dvd[index].getStock());
               jtfReStock.setText("" + dvd[index].getRestockingFee());
               jtfPrice.setText("" + dvd[index].getPrice());
               jtfValue.setText("" + dvd[index].getValue());
               jtftotalInv.setText("" + dvd[index].CalculateTotalInventoryValue(dvd));
}
// to display next movie
void displayFirst(){
        index = 0;
        display();

    }
    void displayNext() {
          index++;
          if(index >= dvd.length )   // wrap around
            index = 0;
          display();
    }
    // display previous
        void displayPrevious() {
            index--;
            if(index < 0)                    // wrap around
              index = dvd.length - 1;
        display();
    }

    void displayLast(){
            index = dvd.length - 1;
            display();
        }


public void actionPerformed(ActionEvent e){
    Object buttonPressed = e.getSource();
    if(buttonPressed == btnFirst){
        index = 0;
        displayFirst();
        return;
    }
    if (buttonPressed == btnNext) {
        displayNext();
        return;
    }
    if (buttonPressed == btnPrevious){
        displayPrevious();
        return;
    }
    if (buttonPressed == btnLast){
        displayLast();
        return;
    }
    display();
}

} // end class GUI