Hello everyone I am a new to java and I am trying to get help with my inventory program. Here is the assignment ..Modify the Inventory Program by adding a button to the GUI that allows the user to move
to the first item, the previous item, the next item, and the last item in the inventory. If the
first item is displayed and the user clicks on the Previous button, the last item should
display. If the last item is displayed and the user clicks on the Next button, the first item
should display.
• Add a company logo to the GUI using Java graphics classes. I am posting the code that I have so far from inventory 4 but i cant get it to compile and run and dont know where to start to complete this portion. Here is the code
/******************************************************************
* Modify the Inventory Program to use a GUI.
* The GUI should display the information
* one product at a time, including the item number,
* the name of the product, the number of units in stock,
* the price of each unit, and the value of the inventory
* of that product. In addition, the GUI should display
* the value of the entire inventory, the additional attribute,
* and the restocking fee.
*******************************************************************/
// Inventory4 program for DVD
import java.util.Arrays;
public class Inventory4 {
public static void main(String[] args) {
FeatDVD dvd= null;
Inventory inventory = new Inventory();
dvd = new FeatDVD(0, "Bad Boys", 5, 12.99f, "Comedy");
inventory.add(dvd);
dvd = new FeatDVD(1, "Color Purple", 7, 14.99f, "Drama");
inventory.add(dvd);
dvd = new FeatDVD(2, "Madea Family Reunion", 6, 13.99f, "Drama");
inventory.add(dvd);
dvd = new FeatDVD(3, "Diary of a Mad Black Woman", 3, 15.99f, "Drama");
inventory.add(dvd);
dvd = new FeatDVD(4, "Forest Gump", 8, 11.99f, "Comedy");
inventory.add(dvd);
dvd = new FeatDVD(5, "How Stella Got Her Groove Back", 2, 12.99f, "Drama");
inventory.add(dvd);
dvd = new FeatDVD(6, "What's love Got to do With it", 7, 15.99f, "Drama");
inventory.add(dvd);
dvd = new FeatDVD(7, "Purple Rain", 7, 11.99f, "Drama");
inventory.add(dvd);
inventory.display();
GUI gui = new GUI(inventory); // Start the GUI
} // end main
} // end class Inventory4
/**** Class decribes DVD while demostrating polymorphism and inheritance**/
class DVD implements Comparable
{
private int dvditem;
private String dvdtitle;
private int dvdstock;
private double dvdprice;
// Constructor
DVD()
{
dvditem = 0;
dvdtitle = "";
dvdstock = 0;
dvdprice = 0;
}// end constructor
//constructor initializes variables
DVD(int item, String title, int stock, double price)
{
this.dvditem = item;
this.dvdtitle = title;
this.dvdstock = stock;
this.dvdprice = price;
}
private void setTitle( String title )
{
this.dvdtitle = title;
}
public String getdvdTitle()
{
return dvdtitle;
}
private void setdvdItem( int item )
{
this.dvditem = item;
}
public int getdvdItem()
{
return dvditem;
}
private void setdvdStock( int stock )
{
this.dvdstock = stock;
}
public int getdvdStock()
{
return dvdstock;
}
private void setdvdPrice (double price )
{
this.dvdprice = price;
}
public double getdvdPrice()
{
return dvdprice;
}
public double getValue()
{
double value = dvdstock * dvdprice;
return value;
}
// This method tells the sort method what is to be sorted
public int compareTo(Object o)
{
return dvdtitle.compareTo(((DVD) o).getdvdTitle());
}
// This method passes the format for the string
public String toString()
{
return String.format("Unit number:%d %12s Units:%2d Price: $%5.2f Movie value: $%6.2f",
dvditem, dvdtitle, dvdstock, dvdprice, getValue());
}
} // end class DVD
/**** This is a subclass that adds 5% restocking fee and new feature***/
class FeatDVD extends DVD
{
private String genres;
// class constructor
FeatDVD(int item, String title, int stock, float price, String genres)
{
super(item, title, stock, price);
this.genres = genres;
}
public double getValue()
{// getvalue method overrides
// getvalue method in the superclass
double value = 1.05F * super.getValue();
return value;
}// end getValue method
public String toString()
{//toString method overrides the superclass toString method
//adding another fields
return super.toString() + "Genre:" + genres;
}// end toString method
}// end class FeatDVD
/*****class has inventory of DVDs.
* This class has methods to add and display dvds****/
class Inventory
{
private DVD[] dvds;
private int nCount;
// constructor
Inventory()
{
dvds = new DVD[10];
nCount = 0;
}
public void add(DVD dvd)
{
dvds[nCount] = dvd;
++nCount;
sort();
}
public int getNcount()
{
return nCount;
}
// method calculates total value of inventory
public double getTotalValue()
{
double totalValue = 0;
for (int i = 0; i < nCount; i++)
totalValue = dvds[i].getValue();
return totalValue;
} // end getTotalValue
public DVD getDVD(int n) //use in GUI
{// protects n and keep in range
if (n<0)
n = 0;
else if (n >= nCount)
n = nCount - 1;
return dvds[n];
}
// sorts the DVDs
private void sort()
{
Arrays.sort(dvds, 0, nCount);
}// end sort method
public void display()
{
System.out.println("\nThe inventory contains " + nCount + "DVDs\n");
for (int i = 0; i < nCount; i++)
System.out.printf("%d: %s\n", i, dvds[i]);
System.out.printf("\nTotal value of the inventory is $%.2f\n", getTotalValue());
} // end display method
} // end class Inventory/*****************************************************
* GUI.java is the graphical part of the program
* for the Inventory part 4 program.
*****************************************************/
//GUI.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
// GUI class creates and maintains the GUI
public class GUI extends JFrame
{
private Inventory inventory; // create new reference to object
private JPanel jpOuterPanel; // for outermost frame
private JPanel jpInstructsPanel; // the instructions
private JPanel currentDataPanel; // the current data header
private JLabel jlCurrentDataTitle; //the current data header
private JLabel jlCurrentDataContents; // the data contents
private JTextField jtfValue; // for data acquisition
private JButton jbNext; // Next button
private int nCurrentDVDnum; //selecting the current dvd
GUI(Inventory inventory)
{
super(" DVD Inventory Program");
this.inventory = inventory;
nCurrentDVDnum = 0;
// creates outer panel
JPanel jp;
jpOuterPanel = new JPanel();
jpOuterPanel.setLayout(new BoxLayout(jpOuterPanel, BoxLayout.Y_AXIS));
// creates title line
jpInstructsPanel = new JPanel();
jpInstructsPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
JLabel jLabel = new JLabel("Click on the 'Next DVD' button to see the next DVD");
jpInstructsPanel.add(jLabel);
jpOuterPanel.add(jpInstructsPanel);
// creates current data line
jp = new JPanel();
jp.setLayout(new FlowLayout(FlowLayout.CENTER));
jlCurrentDataTitle = new JLabel("" + inventory.getDVD(nCurrentDVDnum));
jp.add(jlCurrentDataTitle);
jpOuterPanel.add(jp);
// creates the data contents display line
jp = new JPanel();
jp.setLayout(new FlowLayout(FlowLayout.CENTER));
jlCurrentDataContents = new JLabel("This DVD collection contains " +
inventory.getNcount() + " DVDs");
jp.add(jlCurrentDataContents);
jpOuterPanel.add(jp);
//create text field for data acquisition
jp = new JPanel();
jp.add(new JLabel("Value of DVD collection:"));
jp.setLayout(new FlowLayout(FlowLayout.CENTER));
jtfValue = new JTextField(4);
jtfValue.setText("$" + inventory.getTotalValue());
jtfValue.setEditable(false);
jp.add(jtfValue);
jpOuterPanel.add(jp);
updateFields(); // updates field after next button
// set up and add the next button
jp = new JPanel();
jp.setLayout(new FlowLayout(FlowLayout.CENTER));
jbNext = new JButton("Next DVD");
jbNext.addActionListener(new NextButtonHandler());
jp.add(jbNext);
jpOuterPanel.add(jp);
// quit application when window is closed
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(200, 200, 600, 300); // set frame location and size
// set up the outer panel, turn it on.
setContentPane(jpOuterPanel);
setResizable(false);
setVisible(true);
} // end GUI constructor
private void updateFields() // updates info on the current DVD
{
jlCurrentDataTitle.setText((nCurrentDVDnum+1) + ": " + inventory.getDVD(nCurrentDVDnum));
} // end updateFields method
// inner class to handle the next button
class NextButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent event)
{ // sequences through the inventory
++nCurrentDVDnum;
if (nCurrentDVDnum < inventory.getNcount())
updateFields();
else
jbNext.setEnabled(false);
} // end method
}// end inner class
}// end class GUI
