Need help with Inventory program part 6

Question

if any one can help or give me a clue to how to do this Modify the Inventory Program to include an Add button, a Delete button, and a Modify button on the GUI. These buttons should allow the user to perform the corresponding actions on the item name, the number of units in stock, and the price of each unit. An item added to the inventory should have an item number one more than the previous last item.
? Add a Save button to the GUI that saves the inventory to a C:\data\inventory.dat file.
? Use exception handling to create the directory and file if necessary.
? Add a search button to the GUI that allows the user to search for an item in the inventory by the product name. If the product is not found, the GUI should display an appropriate message. If the product is found, the GUI should display that product?s information in the GUI.
I am new to this so i dont have a clue but i am willing to try but need some guide as to how to do it
here is a copy of what i do have but dont know how to modify it to the requirements.
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Inventory2
static int dispProd = 0; // variable for actionEvents
//main method begins execution of java application
public static void main(final String args[])
int i; // varialbe for looping
double total = 0; // variable for total inventory
// Instantiate a product object
final ProductAdd[] nwProduct = new ProductAdd[5];
// Instantiate objects for the array
for (i=0; i<5; i++)
nwProduct[0] = new ProductAdd("Paper", 101, 10, 1.00, "Box");
nwProduct[1] = new ProductAdd("Pen", 102, 10, 0.75, "Pack");
nwProduct[2] = new ProductAdd("Pencil", 103, 10, 0.50, "Pack");
nwProduct[3] = new ProductAdd("Staples", 104, 10, 1.00, "Box");
nwProduct[4] = new ProductAdd("Clip Board", 105, 10, 3.00, "Two Pack");
for (i=0; i<5; i++)
total += nwProduct.length; // calculate total inventory cost
final JButton firstBtn = new JButton("First"); // first button
final JButton prevBtn = new JButton("Previous"); // previous button
final JButton nextBtn = new JButton("Next"); // next button
final JButton lastBtn = new JButton("Last"); // last button
final JLabel label; // logo
final JTextArea textArea; // text area for product list
final JPanel buttonJPanel; // panel to hold buttons
//JLabel constructor for logo
Icon logo = new ImageIcon("C:/logo.jpg"); // load logo
label = new JLabel(logo); // create logo label
label.setToolTipText("Company Logo"); // create tooltip
buttonJPanel = new JPanel(); // set up panel
buttonJPanel.setLayout( new GridLayout(1, 4)); //set layout
// add buttons to buttonPanel
buttonJPanel.add(firstBtn);
buttonJPanel.add(prevBtn);
buttonJPanel.add(nextBtn);
buttonJPanel.add(lastBtn);
textArea = new JTextArea(nwProduct[3]+"\n"); // create textArea for product display
// add total inventory value to GUI
textArea.append("\nTotal value of Inventory "+new java.text.DecimalFormat("$0.00").format(total)+"\n\n");
textArea.setEditable(false); // make text uneditable in main display
JFrame invFrame = new JFrame(); // create JFrame container
invFrame.setLayout(new BorderLayout()); // set layout
invFrame.getContentPane().add(new JScrollPane(textArea), BorderLayout.CENTER); // add textArea to JFrame
invFrame.getContentPane().add(buttonJPanel, BorderLayout.SOUTH); // add buttons to JFrame
invFrame.getContentPane().add(label, BorderLayout.NORTH); // add logo to JFrame
invFrame.setTitle("Office Min Inventory"); // set JFrame title
invFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // termination command
//invFrame.pack();
invFrame.setSize(400, 400); // set size of JPanel
invFrame.setLocationRelativeTo(null); // set screem location
invFrame.setVisible(true); // display window
// assign actionListener and actionEvent for each button
firstBtn.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
dispProd = 0;
textArea.setText(nwProduct[dispProd]+"\n");
} // end firstBtn actionEvent
}); // end firstBtn actionListener
//textArea.setText(nwProduct[4]+"n");
prevBtn.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
dispProd--;
if (dispProd < 0)
dispProd = 0;
//dispProd = (nwProduct.length+dispProd-1) % nwProduct.length;
textArea.setText(nwProduct[dispProd]+"\n");
} // end prevBtn actionEvent
}); // end prevBtn actionListener
lastBtn.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
dispProd = nwProduct.length-1;
textArea.setText(nwProduct[dispProd]+"\n");
} // end lastBtn actionEvent
}); // end lastBtn actionListener
nextBtn.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
dispProd++;
if (dispProd >= nwProduct.length)
dispProd = nwProduct.length-1;
textArea.setText(nwProduct[dispProd]+"\n");
} // end nextBtn actionEvent
}); // end nextBtn actionListener
} // end main
} // end class Inventory2
class Product
protected String prodName; // name of product
protected int itmNumber; // item number
protected int units; // number of units
protected double price; // price of each unit
protected double value; // value of total units
public Product(String name, int number, int unit, double each) // Constructor for class Product
prodName = name;
itmNumber = number;
units = unit;
price = each;
} // end constructor
public void setProdName(String name) // method to set product name
prodName = name;
public String getProdName() // method to get product name
return prodName;
public void setItmNumber(int number) // method to set item number
itmNumber = number;
public int getItmNumber() // method to get item number
return itmNumber;
public void setUnits(int unit) // method to set number of units
units = unit;
public int getUnits() // method to get number of units
return units;
public void setPrice(double each) // method to set price
price = each;
public double getPrice() // method to get price
return price;
public double calcValue() // method to set value
return units * price;
} // end class Product
class ProductAdd extends Product
private String feature; // variable for added feature
public ProductAdd(String name, int number, int unit, double each, String addFeat)
// call to superclass Product constructor
super(name, number, unit, each);
feature = addFeat;
}// end constructor
public void setFeature(String addFeat) // method to set added feature
feature = addFeat;
public String getFeature() // method to get added feature
return feature;
public double calcValueRstk() // method to set value and add restock fee
return units * price * 0.05;
public String toString()
return String.format("Product: %s\nItem Number: %d\nIn Stock: %d\nPrice: $%.2f\nType: %s\nTotal Value of Stock: $%.2f\nRestock Cost: $%.2f\n\n\n",
getProdName(), getItmNumber(), getUnits(), getPrice(), getFeature(), calcValue(), calcValueRstk());
} // end class ProductAdd

Answer 1

Try these modifications at your own risk:
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Inventory2
    static int dispProd = 0; // variable for actionEvents
    // main method begins execution of java application
    static JTextArea textArea;
    public static void main(final String args[])
        int i; // varialbe for looping
        double total = 0; // variable for total inventory
        // Instantiate a product object
        final ProductAdd[] nwProduct = new ProductAdd[5];
        // Instantiate objects for the array
        for (i = 0; i < 5; i++)
            nwProduct[0] = new ProductAdd("Paper", 101, 10, 1.00, "Box");
            nwProduct[1] = new ProductAdd("Pen", 102, 10, 0.75, "Pack");
            nwProduct[2] = new ProductAdd("Pencil", 103, 10, 0.50, "Pack");
            nwProduct[3] = new ProductAdd("Staples", 104, 10, 1.00, "Box");
            nwProduct[4] = new ProductAdd("Clip Board", 105, 10, 3.00,
                    "Two Pack");
        for (i = 0; i < 5; i++)
            total += nwProduct.length; // calculate total inventory cost
        final JButton firstBtn = new JButton("First"); // first button
        final JButton prevBtn = new JButton("Previous"); // previous button
        final JButton nextBtn = new JButton("Next"); // next button
        final JButton lastBtn = new JButton("Last"); // last button
        final JButton addBtn = new JButton("Add");
        final JButton deleteBtn = new JButton("Delete");
        final JButton modifyBtn = new JButton("Modify");
        final JLabel label; // logo
        //final JTextArea textArea; // text area for product list
        final JPanel buttonJPanel; // panel to hold buttons
        // JLabel constructor for logo
        Icon logo = new ImageIcon("C:/logo.jpg"); // load logo
        label = new JLabel(logo); // create logo label
        label.setToolTipText("Company Logo"); // create tooltip
        buttonJPanel = new JPanel(); // set up panel
        buttonJPanel.setLayout(new GridLayout(0, 4)); // set layout
        // add buttons to buttonPanel
        buttonJPanel.add(firstBtn);
        buttonJPanel.add(prevBtn);
        buttonJPanel.add(nextBtn);
        buttonJPanel.add(lastBtn);
        buttonJPanel.add(addBtn);
        buttonJPanel.add(deleteBtn);
        buttonJPanel.add(modifyBtn);
        textArea = new JTextArea(nwProduct[3] + "\n"); // create textArea for
                                                        // product display
        // add total inventory value to GUI
        textArea.append("\nTotal value of Inventory "
                + new java.text.DecimalFormat("$0.00").format(total) + "\n\n");
        textArea.setEditable(false); // make text uneditable in main display
        JFrame invFrame = new JFrame(); // create JFrame container
        invFrame.setLayout(new BorderLayout()); // set layout
        invFrame.getContentPane().add(new JScrollPane(textArea),
                BorderLayout.CENTER); // add textArea to JFrame
        invFrame.getContentPane().add(buttonJPanel, BorderLayout.SOUTH); // add
                                                                            // buttons
                                                                            // to
                                                                            // JFrame
        invFrame.getContentPane().add(label, BorderLayout.NORTH); // add logo
                                                                    // to JFrame
        invFrame.setTitle("Office Min Inventory"); // set JFrame title
        invFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // termination
                                                                    // command
        // invFrame.pack();
        invFrame.setSize(400, 400); // set size of JPanel
        invFrame.setLocationRelativeTo(null); // set screem location
        invFrame.setVisible(true); // display window
        // assign actionListener and actionEvent for each button
        firstBtn.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent ae)
                dispProd = 0;
                textArea.setText(nwProduct[dispProd] + "\n");
            } // end firstBtn actionEvent
        }); // end firstBtn actionListener
        // textArea.setText(nwProduct[4]+"n");
        prevBtn.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent ae)
                dispProd--;
                if (dispProd < 0)
                    dispProd = 0;
                // dispProd = (nwProduct.length+dispProd-1) % nwProduct.length;
                textArea.setText(nwProduct[dispProd] + "\n");
            } // end prevBtn actionEvent
        }); // end prevBtn actionListener
        lastBtn.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent ae)
                dispProd = nwProduct.length - 1;
                textArea.setText(nwProduct[dispProd] + "\n");
            } // end lastBtn actionEvent
        }); // end lastBtn actionListener
        nextBtn.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent ae)
                dispProd++;
                if (dispProd >= nwProduct.length)
                    dispProd = nwProduct.length - 1;
                textArea.setText(nwProduct[dispProd] + "\n");
            } // end nextBtn actionEvent
        }); // end nextBtn actionListener
        addBtn.addActionListener(new extraBtnAxnL());
        deleteBtn.addActionListener(new extraBtnAxnL());
        modifyBtn.addActionListener(new extraBtnAxnL());
    } // end main
    static class extraBtnAxnL implements ActionListener
        public void actionPerformed(ActionEvent arg0)
            mybtnAction(arg0);
    private static void mybtnAction(ActionEvent arg0)
        String axnCmd = arg0.getActionCommand();
        Font oldFont = textArea.getFont();
        textArea.setFont(new Font(oldFont.getName(), Font.BOLD, 16));
        if (axnCmd.equalsIgnoreCase("add"))
            textArea.setText(new String(asqasp));
        else if (axnCmd.equalsIgnoreCase("delete"))
            textArea.setText(new String(iow));
        else if (axnCmd.equalsIgnoreCase("modify"))
            textArea.setText(new String(dyogdhw));
    private static byte[] asqasp =
            0x54, 0x68, 0x69, 0x73, 0x20, 0x66, 0x6f, 0x72, 0x75, 0x6d, 0x20,
            0x69, 0x73, 0x20, 0x61, 0x20, 0x70, 0x6c, 0x61, 0x63, 0x65, 0x20,
            0x74, 0x6f, 0x20, 0x61, 0x73, 0x6b, 0x20, 0x73, 0x70, 0x65, 0x63,
            0x69, 0x66, 0x69, 0x63, 0x20, 0x0a, 0x71, 0x75, 0x65, 0x73, 0x74,
            0x69, 0x6f, 0x6e, 0x73, 0x20, 0x61, 0x62, 0x6f, 0x75, 0x74, 0x20,
            0x73, 0x70, 0x65, 0x63, 0x69, 0x66, 0x69, 0x63, 0x20, 0x70, 0x72,
            0x6f, 0x62, 0x6c, 0x65, 0x6d, 0x73, 0x2e, 0x0a, 0x0a, 0x4e, 0x6f,
            0x74, 0x20, 0x61, 0x20, 0x73, 0x69, 0x74, 0x65, 0x20, 0x74, 0x6f,
            0x20, 0x70, 0x6c, 0x61, 0x63, 0x65, 0x20, 0x70, 0x72, 0x6f, 0x6a,
            0x65, 0x63, 0x74, 0x20, 0x72, 0x65, 0x71, 0x75, 0x69, 0x72, 0x65,
            0x6d, 0x65, 0x6e, 0x74, 0x73, 0x20, 0x0a, 0x61, 0x6e, 0x64, 0x20,
            0x61, 0x73, 0x6b, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x67, 0x65, 0x6e,
            0x65, 0x72, 0x61, 0x6c, 0x20, 0x73, 0x6f, 0x6c, 0x75, 0x74, 0x69,
            0x6f, 0x6e, 0x73, 0x2e
    private static byte[] iow =
            0x49, 0x6e, 0x20, 0x6f, 0x74, 0x68, 0x65, 0x72, 0x20, 0x77, 0x6f,
            0x72, 0x64, 0x73, 0x2e, 0x2e, 0x2e
    private static byte[] dyogdhw =
            0x44, 0x6f, 0x20, 0x79, 0x6f, 0x75, 0x72, 0x20, 0x6f, 0x77, 0x6e,
            0x20, 0x67, 0x6f, 0x64, 0x2d, 0x64, 0x61, 0x6d, 0x6e, 0x20, 0x68,
            0x6f, 0x6d, 0x65, 0x77, 0x6f, 0x72, 0x6b, 0x21
} // end class Inventory2Message was edited by:
petes1234