I keep getting these errors when I try to run the program 

Exception in thread "main" java.lang.NumberFormatException: For input string: "GTR"
     at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
        at java.lang.Integer.parseInt(Integer.java:449)
        at java.lang.Integer.parseInt(Integer.java:499)
        at Inventory6.addProductToInventory2(Inventory6.java:549)
        at Inventory6.main(Inventory6.java:734)

I've spent hours trying to figure out what I'm doing wrong and it's due in a few hours. I also cannot get an image added to my gui either.

//Inventory6.java
//include an add, delete and modify button, a save and search button


import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.FlowLayout;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.Dimension;
import java.net.URL;
import java.io.*;
import java.util.*;







class Inventory implements Serializable
{

    String name;
    String stocknumber;
    int units;
    double price;

    public Inventory(String Name, String stockNumber,  int Units, double Price)
    {
        name = Name;
        stocknumber = stockNumber;
        units = Units;
        price = Price;
    }

    public void setName(String Name)
    {
        name = Name;
    }
    public String getName()
    {
        return name;
    }


    public void setstockNumber(String stockNumber)
    {
        stocknumber = stockNumber;
    }
    public String getstockNumber()
    {
        return stocknumber;
    }



    public void setUnits(int Units)
    {
        units = Units;
    }
    public int getUnits()
    {
        return units;
    }



    public void setPrice(double Price)
    {
        price = Price;
    }
    public double getPrice()
    {
        return price;
    }


    public double getInventoryValue()  
    {
        return price * units;
    }


    @Override
    public String toString()
    {
        return "Product Name: "+name + "\nProduct stockNumber : "+stocknumber+"\nProduct Price: $"+price+"\nUnits in Stock: "+units + "\nInventory Value: $"+getInventoryValue();
    }
} // end Inventory Class



class Product extends Inventory
{

    String Model;
    double restockFee;


    public Product(String Model, double restockFee, String Name, String stockNumber,  int Units,  double Price)
    {
        super(Name, stockNumber, Units, Price);
        this.Model = Model;
        this.restockFee = restockFee;
    }

    public Product(String Model, String Name, String stockNumber,  int Units, double Price)
    {
        super(Name, stockNumber, Units, Price);
        this.Model = Model;
        //restocking fee is 5%
        this.restockFee = 0.05;
    }

    public void setModel(String model)
    {
        model = Model;
    }
    public String getModel()
    {
        return Model;
    }


    public double getRestockFee() 
    {
        return super.getInventoryValue() * restockFee;
    }

    @Override
    public double getInventoryValue()  
    {
        return  super.getInventoryValue() + (super.getInventoryValue() * restockFee);
    }

    @Override
    public String toString()
    {
        StringBuffer sb = new StringBuffer("\nModel: ").append(Model).append("\n");
        sb.append(super.toString());

        return sb.toString();
    }

} // End Product Class


class Inventory2 implements Serializable
{

        public static int MAXIMUM_SIZE = 1000;


    // store Nissan models
    Product[] inventory;


    int number_of_models_in_inventory = 0;


    public Inventory2(int maximum_number_of_models)
    {
        inventory = new Product[maximum_number_of_models];
    }


    public void addProduct(Product models_to_add_to_inventory)
    {
        inventory[number_of_models_in_inventory] = models_to_add_to_inventory;
        number_of_models_in_inventory++;
    }

    public Product getProduct(int index)
    {
        return inventory[index];
    }



    public void setProduct(Product p, int index)
    {
        inventory[index] = p;
    }


    public int getSize()
    {
        return number_of_models_in_inventory;
    }



    // return the maximum number of Nissan models
    public int getMaxSize()
    {
        return inventory.length;
    }

    // add up Nissan models with restocking fee
    public double getTotalValueOfAllInventory()
    {
        double tot = 0.00;

        for(int i = 0; i < number_of_models_in_inventory; i++)
        {
            tot += inventory[i].getInventoryValue();
        }
        return tot;
    }


    public void sortInventory()
    {

        for(int j = 0; j < number_of_models_in_inventory - 1; j++)
        {
            for(int k = 0; k < number_of_models_in_inventory - 1; k++)
            {
                if(inventory[k].getName().compareToIgnoreCase(inventory[k+1].getName()) > 0)
                {
                    Product temp = inventory[k];
                    inventory[k] = inventory[k+1];
                    inventory[k+1] = temp;
                }
            }
        }
    }



    public Inventory2 deleteProduct(int index) {

        Inventory2 newInventory2 = new Inventory2(inventory.length);

        for (int i = 0; i < this.getSize(); i++) {
            if (i != index)
                newInventory2.addProduct(this.getProduct(i));
        }

        return newInventory2;
    }


    public int searchForProductByName(String searchString) {
        // go through each Nissan model of inventory
        int i = 0;
        for ( i = 0; i < this.getSize(); i++ ) {
            Product p = this.getProduct(i);
            // does the name match
            if ( p.getName().matches("(?i).*"+searchString+".*") ) {
                // return index if model found
                return i;
            }
        }

        return -1;
    }

}


public class Inventory6 extends JFrame
{


    Inventory2 ProductInventory2;

    int index = 0;

    int lastNumberAdded = 0;



    // GUI 
    private final JLabel nameLabel = new JLabel(" Product Name: ");
    private JTextField nameText;

    private final JLabel stocknumberLabel = new JLabel(" Product stockNumber: ");
    private JTextField stocknumberText;

    private final JLabel modelLabel = new JLabel(" Model: ");
    private JTextField modelText;

    private final JLabel priceLabel = new JLabel(" Price: ");
    private JTextField priceText;

    private final JLabel unitsLabel = new JLabel(" Units: ");
    private JTextField unitsText;

    private final JLabel valueLabel = new JLabel(" Value: ");
    private JTextField valueText;

    private final JLabel restockFeeLabel = new JLabel(" Restocking Fee: ");
    private JTextField restockFeeText;

    private final JLabel totalValueLabel = new JLabel(" Inventory Total: ");
    private JLabel totalValueText;


    private Action nextAction  = new AbstractAction("Next") {
        public void actionPerformed(ActionEvent evt) {

        if (index == ProductInventory2.getSize() - 1) {
            index = 0;
        } else {
            index++;
        }

        repaint();
        }
    };
    private JButton nextButton = new JButton(nextAction);

    // go to the previous model
    private Action previousAction  = new AbstractAction("Previous") {
        public void actionPerformed(ActionEvent evt) {


        if (index == 0) {
            index = ProductInventory2.getSize() - 1;
        } else {
            index--;
        }

        repaint();
        }
    };
    private JButton previousButton = new JButton(previousAction);

    // go to the first model
    private Action firstAction  = new AbstractAction("First") {
        public void actionPerformed(ActionEvent evt) {

        index = 0;

        repaint();
        }
    };
    private JButton firstButton = new JButton(firstAction);

    // go to last model
    private Action lastAction  = new AbstractAction("Last") {
        public void actionPerformed(ActionEvent evt) {

        index = ProductInventory2.getSize() - 1;

        repaint();
        }
    };
    private JButton lastButton = new JButton(lastAction);


    Action searchAction = new AbstractAction("Search") {
        public void actionPerformed(ActionEvent evt) {
            if (searchButton.getText().equals("Search")) {

                // change text
                searchButton.setText("GO!");

                // model may be changed
                nameText.setEditable(true);

            } else if (searchButton.getText().equals("GO!")) {

                nameText.setEditable(false);

                String inputName = nameText.getText();

                int i = ProductInventory2.searchForProductByName(inputName);
                if ( i >= 0 ) {
                    index = i;
                    repaint();

                } else {

                    JOptionPane.showMessageDialog(null, "No Matches Found!");
                }

                searchButton.setText("Search");
            }

            repaint();
        }
    };
    JButton searchButton = new JButton(searchAction);


    Action deleteAction = new AbstractAction("Delete") {
            public void actionPerformed(ActionEvent evt) {

                ProductInventory2 = ProductInventory2.deleteProduct(index);


                index = index - 1;
                if (index < 0) {
                    index = 0;
                }

                repaint();
            }
        };
    JButton deleteButton = new JButton(deleteAction);

    Action saveAction = new AbstractAction("Save") {
        public void actionPerformed(ActionEvent evt) {
            saveInventory2ToFile();
        }
    };
    JButton saveButton = new JButton(saveAction);

    Action loadAction = new AbstractAction("Load File") {
        public void actionPerformed(ActionEvent evt) {
            loadInventory2FromFile();
        }
    };
    JButton loadButton = new JButton(loadAction);

    Action addAction = new AbstractAction("Add") {
            public void actionPerformed(ActionEvent evt) {
                if (addButton.getText().equals("Add")) {
                    addButton.setText("Click to Add!");

                    nameText.setEditable(true);
                    stocknumberText.setEditable(true);
                    modelText.setEditable(true);
                    priceText.setEditable(true);
                    unitsText.setEditable(true);

                    nameText.setText("");
                    stocknumberText.setText("" + (lastNumberAdded + 1));
                    modelText.setText("");
                    priceText.setText("$0.00");
                    unitsText.setText("0");

                    valueText.setText("$0.00");
                    restockFeeText.setText("$0.00");


                } else if (addButton.getText().equals("Click to Add!")) {

                    try {

                        String Name = nameText.getText().trim();
                        String stockNumber = stocknumberText.getText().trim();
                        String Model = modelText.getText().trim();
                        String Units = unitsText.getText().trim();
                        String strPrice = priceText.getText().trim();


                        int in_stock = Integer.parseInt ( Units );
                        strPrice = strPrice.replaceAll("\\$", "");
                        Double price = Double.parseDouble( strPrice );

                        Product newProduct = new Product(Model, stockNumber, Name, in_stock, price   );
                        addProductToInventory2(newProduct);


                       index=ProductInventory2.getSize()- 1;



                    } catch (Exception addException) {

                        JOptionPane.showMessageDialog(null, "Error adding Nissan Model information:\n" +  addException);
                        index = 0;

                    }

                    addButton.setText("Add");

                    nameText.setEditable(false);
                    stocknumberText.setEditable(false);
                    modelText.setEditable(false);
                    priceText.setEditable(false);
                    unitsText.setEditable(false);

                    repaint();

                }
            }
        };

    JButton addButton = new JButton(addAction);

    Action modifyAction = new AbstractAction("Modify") {
            public void actionPerformed(ActionEvent evt) {
                if (modifyButton.getText().equals("Modify")) {
                    modifyButton.setText("Click to Modify!");

                    nameText.setEditable(true);
                    stocknumberText.setEditable(true);
                    modelText.setEditable(true);
                    priceText.setEditable(true);
                    unitsText.setEditable(true);


                } else if (modifyButton.getText().equals("Click to Modify!")) {

                    try {

                        String Name = nameText.getText().trim();
                        String stockNumber = stocknumberText.getText().trim();
                        String model = modelText.getText().trim();
                        String Units = unitsText.getText().trim();
                        String strPrice = priceText.getText().trim();


                        int in_stock = Integer.parseInt ( Units );
                        strPrice = strPrice.replaceAll("\\$", "");
                        Double price = Double.parseDouble( strPrice );

                        Product newProduct = new Product(model, stockNumber, Name, in_stock, price   );
                        ProductInventory2.setProduct(newProduct, index);

                    } catch (Exception modifyException) {

                        JOptionPane.showMessageDialog(null, "Error modifying Nissan model information:\n" +  modifyException);

                    }

                    modifyButton.setText("Modify");

                    nameText.setEditable(false);
                    stocknumberText.setEditable(false);
                    modelText.setEditable(false);
                    priceText.setEditable(false);
                    unitsText.setEditable(false);


                    repaint();

                }
            }
        };
    JButton modifyButton = new JButton(modifyAction);



    public void addProductToInventory2(Product temp)
    {
        ProductInventory2.addProduct(temp);

                lastNumberAdded = Integer.parseInt(temp.getModel());
        repaint();
    }
    public void sortProductInventory2()
    {
        ProductInventory2.sortInventory();
        index = 0;
        repaint();
    }




    public void saveInventory2ToFile() {

    File theDir = new File("C:\\data");
    theDir.mkdir();

    File theFile = new File("C:\\data\\inventory.dat");


    try {

        FileOutputStream fileOut = new FileOutputStream( theFile );

        ObjectOutputStream objOut = new ObjectOutputStream( fileOut );

        objOut.writeObject(ProductInventory2);

        objOut.flush();
        objOut.close();

    } catch (IOException e) {

        JOptionPane.showMessageDialog(null, "Error occured while writing to file:" + e);

    }

    }

    public int loadInventory2FromFile() {

    Inventory2 oldProductInventory2 = ProductInventory2;

    File theFile = new File("C:\\data\\inventory.dat");


    try {

        FileInputStream fileIn = new FileInputStream( theFile );
        ObjectInputStream objIn = new ObjectInputStream( fileIn );

        ProductInventory2 = (Inventory2)objIn.readObject();

        objIn.close();


     } catch (Exception e) {

        JOptionPane.showMessageDialog(null, "Could not load file:"  + e);

        ProductInventory2 = oldProductInventory2;
        oldProductInventory2 = null;

        return -1;
    }

    oldProductInventory2 = null;

    // update GUI
    repaint();

    return 0;
    }


public Inventory6(int maximum_number_of_models)
    {
        ProductInventory2 = new Inventory2(maximum_number_of_models);

        // setup the GUI
        // add the next Nissan model button to the top of the GUI
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(firstButton);
        buttonPanel.add(previousButton);
        buttonPanel.add(nextButton);
        buttonPanel.add(lastButton);
        getContentPane().add(buttonPanel, BorderLayout.SOUTH);



        JPanel dataButtonPanel = new JPanel();
        dataButtonPanel.add(addButton);
        dataButtonPanel.add(deleteButton);
        dataButtonPanel.add(modifyButton);
        dataButtonPanel.add(searchButton);
        dataButtonPanel.add(saveButton);
        dataButtonPanel.add(loadButton);
        getContentPane().add(dataButtonPanel, BorderLayout.NORTH);



        // logo
        URL url = this.getClass().getResource("");
           Image img = Toolkit.getDefaultToolkit().getImage(url);
        Image scaledImage = img.getScaledInstance(205, 300, Image.SCALE_AREA_AVERAGING);
        Icon logoIcon = new ImageIcon(scaledImage);
        JLabel companyLogoLabel = new JLabel(logoIcon);

        // add logo
        getContentPane().add(companyLogoLabel, BorderLayout.WEST);

        JPanel centerPanel = new JPanel(new GridLayout(8, 2, 0, 4));

        centerPanel.add(nameLabel);
        nameText = new JTextField("");
        nameText.setEditable(false);
        centerPanel.add(nameText);

        centerPanel.add(stocknumberLabel);
        stocknumberText = new JTextField("");
        stocknumberText.setEditable(false);
        centerPanel.add(stocknumberText);

        centerPanel.add(modelLabel);
        modelText = new JTextField("");
        modelText.setEditable(false);
        centerPanel.add(modelText);

        centerPanel.add(priceLabel);
        priceText = new JTextField("");
        priceText.setEditable(false);
        centerPanel.add(priceText);

        centerPanel.add(unitsLabel);
        unitsText = new JTextField("");
        unitsText.setEditable(false);
        centerPanel.add(unitsText);

        centerPanel.add(valueLabel);
        valueText = new JTextField("");
        valueText.setEditable(false);
        centerPanel.add(valueText);

        centerPanel.add(restockFeeLabel);
        restockFeeText = new JTextField("");
        restockFeeText.setEditable(false);
        centerPanel.add(restockFeeText);

        centerPanel.add(totalValueLabel);
        totalValueText = new JLabel("");
        centerPanel.add(totalValueText);

        getContentPane().add(centerPanel, BorderLayout.CENTER);

        repaint();
    }


    @Override
    public void repaint() {

        Product temp = ProductInventory2.getProduct(index);

        if (temp != null) {
            nameText.setText( temp.getName() );
            stocknumberText.setText( ""+temp.getstockNumber() );
            modelText.setText( temp.getModel() );
            priceText.setText( String.format("$%.2f", temp.getPrice()) );
            unitsText.setText( ""+temp.getUnits() );
            valueText.setText( String.format("$%.2f", temp.getPrice() * temp.getUnits() ) );
            restockFeeText.setText( String.format("$%.2f", temp.getRestockFee() ) );
        }

        totalValueText.setText( String.format("$%.2f", ProductInventory2.getTotalValueOfAllInventory() ) );

    }


    public static void main(String args[])
    {

        Inventory6 Product_GUI = new Inventory6 (40);

        // Add the Nissan models
        Product_GUI.addProductToInventory2(new Product("Frontier","3", "wheels" ,14, 000.00));
        Product_GUI.addProductToInventory2(new Product("Cube", "5", "floormats" ,12, 000.00));
            Product_GUI.addProductToInventory2(new Product("Quest", "1","radio",12,000.00));
        Product_GUI.addProductToInventory2(new Product("Rogue","3", "tires",30, 000.00));
                Product_GUI.addProductToInventory2(new Product("Armada","2", "dvdplayer",50, 000.00));


        // sort models
        Product_GUI.sortProductInventory2();

        Product_GUI.loadInventory2FromFile();


        Product_GUI.setDefaultCloseOperation( EXIT_ON_CLOSE );
        Product_GUI.pack();
        Product_GUI.setSize(700, 350);
        Product_GUI.setResizable(false);
        Product_GUI.setLocationRelativeTo( null );
        Product_GUI.setVisible(true);

        return;

    }
}  // End Inventory6 class

Edited 3 Years Ago by Dani: Formatting fixed

Theres a LOT of code there.. But I think your problem is as follows:

In the Product class you've defined the constructors as follows:

public Product(String Model, double restockFee, String Name, String stockNumber, int Units, double Price)

and

public Product(String Model, String Name, String stockNumber, int Units, double Price)

The call to the method causing the problem is:

Product_GUI.addProductToInventory2(new Product("Frontier","3", "wheels" ,14, 000.00));

All looks fine here. But if you look at the definition for addProductToInventory2() it's:

public void addProductToInventory2(Product temp)
{
ProductInventory2.addProduct(temp);

lastNumberAdded = Integer.parseInt(temp.getModel());
repaint();
}

Here, you are parsing the value of model into an Integer, and what the actual call Product_GUI.addProductToInventory2(new Product("Frontier","3", "wheels" ,14, 000.00)); is trying to do is turn the string "Frontier" into an Integer, as "Frontier" will be the value of model.

This is not possible, so it will throw a NumberFormatException .

On a quick glance, that's what seems to be causing the problem!

Please edit you program and add code tags to preserve the formatting.
Use the icon to the right above the input text field: [ code ].

Exception in thread "main" java.lang.NumberFormatException: For input string: "GTR"

Where did the input the string "GTR" that shows in the error message come from?
What data does: temp.getModel() return?
Capture it in a String and print it before trying to convert it to an int

//Inventory6.java
//include an add, delete and modify button, a save and search button


import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.FlowLayout;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.Dimension;
import java.net.URL;
import java.io.*;
import java.util.*;







class Inventory implements Serializable
{

	String name;
	String stocknumber;
	int units;
	double price;

	public Inventory(String Name, String stockNumber,  int Units, double Price)
	{
		name = Name;
		stocknumber = stockNumber;
		units = Units;
		price = Price;
	}

	public void setName(String Name)
	{
		name = Name;
	}
	public String getName()
	{
		return name;
	}


	public void setstockNumber(String stockNumber)
	{
		stocknumber = stockNumber;
	}
	public String getstockNumber()
	{
		return stocknumber;
	}



	public void setUnits(int Units)
	{
		units = Units;
	}
	public int getUnits()
	{
		return units;
	}



	public void setPrice(double Price)
	{
		price = Price;
	}
	public double getPrice()
	{
		return price;
	}


	public double getInventoryValue()  
	{
		return price * units;
	}


    @Override
	public String toString()
	{
		return "Product Name: "+name + "\nProduct stockNumber : "+stocknumber+"\nProduct Price: $"+price+"\nUnits in Stock: "+units + "\nInventory Value: $"+getInventoryValue();
	}
} // end Inventory Class



class Product extends Inventory
{

	String Model;
	double restockFee;

	
	public Product(String Model, double restockFee, String Name, String stockNumber,  int Units,  double Price)
	{
		super(Name, stockNumber, Units, Price);
		this.Model = Model;
		this.restockFee = restockFee;
	}

	public Product(String Model, String Name, String stockNumber,  int Units, double Price)
	{
		super(Name, stockNumber, Units, Price);
		this.Model = Model;
		//restocking fee is 5%
		this.restockFee = 0.05;
	}

	public void setModel(String model)
	{
		model = Model;
	}
	public String getModel()
	{
		return Model;
	}


	public double getRestockFee() 
	{
		return super.getInventoryValue() * restockFee;
	}

    @Override
	public double getInventoryValue()  
	{
		return  super.getInventoryValue() + (super.getInventoryValue() * restockFee);
	}

    @Override
	public String toString()
	{
		StringBuffer sb = new StringBuffer("\nModel: ").append(Model).append("\n");
		sb.append(super.toString());

		return sb.toString();
	}

} // End Product Class


class Inventory2 implements Serializable
{

        public static int MAXIMUM_SIZE = 1000;


	// store Nissan models
	Product[] inventory;

	
	int number_of_models_in_inventory = 0;

	
	public Inventory2(int maximum_number_of_models)
	{
		inventory = new Product[maximum_number_of_models];
	}

	
	public void addProduct(Product models_to_add_to_inventory)
	{
		inventory[number_of_models_in_inventory] = models_to_add_to_inventory;
		number_of_models_in_inventory++;
	}
	
	public Product getProduct(int index)
	{
		return inventory[index];
	}


    
	public void setProduct(Product p, int index)
	{
		inventory[index] = p;
	}


	public int getSize()
	{
		return number_of_models_in_inventory;
	}



    // return the maximum number of Nissan models
    public int getMaxSize()
    {
		return inventory.length;
    }

    // add up Nissan models with restocking fee
	public double getTotalValueOfAllInventory()
	{
		double tot = 0.00;

		for(int i = 0; i < number_of_models_in_inventory; i++)
		{
			tot += inventory[i].getInventoryValue();
		}
		return tot;
	}


	public void sortInventory()
	{
	
		for(int j = 0; j < number_of_models_in_inventory - 1; j++)
		{
		    for(int k = 0; k < number_of_models_in_inventory - 1; k++)
		    {
		        if(inventory[k].getName().compareToIgnoreCase(inventory[k+1].getName()) > 0)
		        {
		            Product temp = inventory[k];
		            inventory[k] = inventory[k+1];
		            inventory[k+1] = temp;
		        }
		    }
		}
	}



	public Inventory2 deleteProduct(int index) {

		Inventory2 newInventory2 = new Inventory2(inventory.length);

		for (int i = 0; i < this.getSize(); i++) {
			if (i != index)
				newInventory2.addProduct(this.getProduct(i));
		}

		return newInventory2;
	}

	
	public int searchForProductByName(String searchString) {
		// go through each Nissan model of inventory
		int i = 0;
		for ( i = 0; i < this.getSize(); i++ ) {
			Product p = this.getProduct(i);
			// does the name match
			if ( p.getName().matches("(?i).*"+searchString+".*") ) {
				// return index if model found
				return i;
			}
		}

		return -1;
	}

}


public class Inventory6 extends JFrame
{

	
	Inventory2 ProductInventory2;

	int index = 0;

	int lastNumberAdded = 0;



    // GUI 
	private final JLabel nameLabel = new JLabel(" Product Name: ");
	private JTextField nameText;

	private final JLabel stocknumberLabel = new JLabel(" Product stockNumber: ");
	private JTextField stocknumberText;

	private final JLabel modelLabel = new JLabel(" Model: ");
	private JTextField modelText;

	private final JLabel priceLabel = new JLabel(" Price: ");
	private JTextField priceText;

	private final JLabel unitsLabel = new JLabel(" Units: ");
	private JTextField unitsText;

	private final JLabel valueLabel = new JLabel(" Value: ");
	private JTextField valueText;

	private final JLabel restockFeeLabel = new JLabel(" Restocking Fee: ");
	private JTextField restockFeeText;

	private final JLabel totalValueLabel = new JLabel(" Inventory Total: ");
	private JLabel totalValueText;


	private Action nextAction  = new AbstractAction("Next") {
		public void actionPerformed(ActionEvent evt) {

		if (index == ProductInventory2.getSize() - 1) {
		    index = 0;
		} else {
		    index++;
		}

		repaint();
		}
    };
	private JButton nextButton = new JButton(nextAction);

    // go to the previous model
    private Action previousAction  = new AbstractAction("Previous") {
	    public void actionPerformed(ActionEvent evt) {

	
		if (index == 0) {
		    index = ProductInventory2.getSize() - 1;
		} else {
		    index--;
		}

		repaint();
	    }
    };
    private JButton previousButton = new JButton(previousAction);

    // go to the first model
    private Action firstAction  = new AbstractAction("First") {
	    public void actionPerformed(ActionEvent evt) {

		index = 0;

		repaint();
	    }
    };
    private JButton firstButton = new JButton(firstAction);

    // go to last model
    private Action lastAction  = new AbstractAction("Last") {
	    public void actionPerformed(ActionEvent evt) {

		index = ProductInventory2.getSize() - 1;

		repaint();
	    }
    };
    private JButton lastButton = new JButton(lastAction);


	Action searchAction = new AbstractAction("Search") {
		public void actionPerformed(ActionEvent evt) {
			if (searchButton.getText().equals("Search")) {

				// change text
				searchButton.setText("GO!");

				// model may be changed
				nameText.setEditable(true);

			} else if (searchButton.getText().equals("GO!")) {

				nameText.setEditable(false);

				String inputName = nameText.getText();

				int i = ProductInventory2.searchForProductByName(inputName);
				if ( i >= 0 ) {
					index = i;
					repaint();

				} else {
					
					JOptionPane.showMessageDialog(null, "No Matches Found!");
				}

				searchButton.setText("Search");
			}

			repaint();
		}
	};
	JButton searchButton = new JButton(searchAction);

	
	Action deleteAction = new AbstractAction("Delete") {
			public void actionPerformed(ActionEvent evt) {

				ProductInventory2 = ProductInventory2.deleteProduct(index);

				
				index = index - 1;
				if (index < 0) {
					index = 0;
				}

				repaint();
			}
		};
	JButton deleteButton = new JButton(deleteAction);

	Action saveAction = new AbstractAction("Save") {
		public void actionPerformed(ActionEvent evt) {
			saveInventory2ToFile();
		}
	};
	JButton saveButton = new JButton(saveAction);

	Action loadAction = new AbstractAction("Load File") {
		public void actionPerformed(ActionEvent evt) {
			loadInventory2FromFile();
		}
	};
	JButton loadButton = new JButton(loadAction);

	Action addAction = new AbstractAction("Add") {
			public void actionPerformed(ActionEvent evt) {
				if (addButton.getText().equals("Add")) {
					addButton.setText("Click to Add!");

					nameText.setEditable(true);
					stocknumberText.setEditable(true);
					modelText.setEditable(true);
					priceText.setEditable(true);
					unitsText.setEditable(true);

					nameText.setText("");
					stocknumberText.setText("" + (lastNumberAdded + 1));
					modelText.setText("");
					priceText.setText("$0.00");
					unitsText.setText("0");

					valueText.setText("$0.00");
					restockFeeText.setText("$0.00");

					
				} else if (addButton.getText().equals("Click to Add!")) {

					try {
						
						String Name = nameText.getText().trim();
						String stockNumber = stocknumberText.getText().trim();
						String Model = modelText.getText().trim();
						String Units = unitsText.getText().trim();
						String strPrice = priceText.getText().trim();

						
						int in_stock = Integer.parseInt ( Units );
						strPrice = strPrice.replaceAll("\\$", "");
						Double price = Double.parseDouble( strPrice );

						Product newProduct = new Product(Model, stockNumber, Name, in_stock, price   );
						addProductToInventory2(newProduct);

                       
                       index=ProductInventory2.getSize()- 1;



					} catch (Exception addException) {

						JOptionPane.showMessageDialog(null, "Error adding Nissan Model information:\n" +  addException);
						index = 0;

					}

					addButton.setText("Add");

					nameText.setEditable(false);
					stocknumberText.setEditable(false);
					modelText.setEditable(false);
					priceText.setEditable(false);
					unitsText.setEditable(false);

					repaint();

				}
			}
		};

	JButton addButton = new JButton(addAction);

	Action modifyAction = new AbstractAction("Modify") {
			public void actionPerformed(ActionEvent evt) {
				if (modifyButton.getText().equals("Modify")) {
					modifyButton.setText("Click to Modify!");

					nameText.setEditable(true);
					stocknumberText.setEditable(true);
					modelText.setEditable(true);
					priceText.setEditable(true);
					unitsText.setEditable(true);

				
				} else if (modifyButton.getText().equals("Click to Modify!")) {

					try {
						
						String Name = nameText.getText().trim();
						String stockNumber = stocknumberText.getText().trim();
						String model = modelText.getText().trim();
						String Units = unitsText.getText().trim();
						String strPrice = priceText.getText().trim();

					
						int in_stock = Integer.parseInt ( Units );
						strPrice = strPrice.replaceAll("\\$", "");
						Double price = Double.parseDouble( strPrice );

						Product newProduct = new Product(model, stockNumber, Name, in_stock, price   );
						ProductInventory2.setProduct(newProduct, index);

					} catch (Exception modifyException) {

						JOptionPane.showMessageDialog(null, "Error modifying Nissan model information:\n" +  modifyException);

					}

					modifyButton.setText("Modify");

					nameText.setEditable(false);
					stocknumberText.setEditable(false);
					modelText.setEditable(false);
					priceText.setEditable(false);
					unitsText.setEditable(false);

				
					repaint();

				}
			}
		};
	JButton modifyButton = new JButton(modifyAction);



    public void addProductToInventory2(Product temp)
	{
		ProductInventory2.addProduct(temp);

                lastNumberAdded = Integer.parseInt(temp.getModel());
        repaint();
	}
	public void sortProductInventory2()
	{
		ProductInventory2.sortInventory();
		index = 0;
        repaint();
	}



    
    public void saveInventory2ToFile() {

	File theDir = new File("C:\\data");
	theDir.mkdir();

	File theFile = new File("C:\\data\\inventory.dat");


	try {
	   
	    FileOutputStream fileOut = new FileOutputStream( theFile );

	    ObjectOutputStream objOut = new ObjectOutputStream( fileOut );

	    objOut.writeObject(ProductInventory2);

	    objOut.flush();
	    objOut.close();

	} catch (IOException e) {

	    JOptionPane.showMessageDialog(null, "Error occured while writing to file:" + e);

	}

    }

    public int loadInventory2FromFile() {

	Inventory2 oldProductInventory2 = ProductInventory2;

	File theFile = new File("C:\\data\\inventory.dat");


	try {

	    FileInputStream fileIn = new FileInputStream( theFile );
	    ObjectInputStream objIn = new ObjectInputStream( fileIn );

	    ProductInventory2 = (Inventory2)objIn.readObject();

	    objIn.close();


	 } catch (Exception e) {

	    JOptionPane.showMessageDialog(null, "Could not load file:"  + e);

	    ProductInventory2 = oldProductInventory2;
	    oldProductInventory2 = null;

	    return -1;
	}

	oldProductInventory2 = null;

	// update GUI
	repaint();

	return 0;
    }


public Inventory6(int maximum_number_of_models)
	{
		ProductInventory2 = new Inventory2(maximum_number_of_models);

		// setup the GUI
		// add the next Nissan model button to the top of the GUI
		JPanel buttonPanel = new JPanel();
		buttonPanel.add(firstButton);
		buttonPanel.add(previousButton);
		buttonPanel.add(nextButton);
	    buttonPanel.add(lastButton);
		getContentPane().add(buttonPanel, BorderLayout.SOUTH);



        JPanel dataButtonPanel = new JPanel();
        dataButtonPanel.add(addButton);
        dataButtonPanel.add(deleteButton);
        dataButtonPanel.add(modifyButton);
        dataButtonPanel.add(searchButton);
        dataButtonPanel.add(saveButton);
        dataButtonPanel.add(loadButton);
        getContentPane().add(dataButtonPanel, BorderLayout.NORTH);



        // logo
		URL url = this.getClass().getResource("");
		   Image img = Toolkit.getDefaultToolkit().getImage(url);
		Image scaledImage = img.getScaledInstance(205, 300, Image.SCALE_AREA_AVERAGING);
		Icon logoIcon = new ImageIcon(scaledImage);
		JLabel companyLogoLabel = new JLabel(logoIcon);

		// add logo
		getContentPane().add(companyLogoLabel, BorderLayout.WEST);

		JPanel centerPanel = new JPanel(new GridLayout(8, 2, 0, 4));

		centerPanel.add(nameLabel);
		nameText = new JTextField("");
		nameText.setEditable(false);
		centerPanel.add(nameText);

		centerPanel.add(stocknumberLabel);
		stocknumberText = new JTextField("");
		stocknumberText.setEditable(false);
		centerPanel.add(stocknumberText);

		centerPanel.add(modelLabel);
		modelText = new JTextField("");
		modelText.setEditable(false);
		centerPanel.add(modelText);

		centerPanel.add(priceLabel);
		priceText = new JTextField("");
		priceText.setEditable(false);
		centerPanel.add(priceText);

		centerPanel.add(unitsLabel);
		unitsText = new JTextField("");
		unitsText.setEditable(false);
		centerPanel.add(unitsText);

		centerPanel.add(valueLabel);
		valueText = new JTextField("");
		valueText.setEditable(false);
		centerPanel.add(valueText);

		centerPanel.add(restockFeeLabel);
		restockFeeText = new JTextField("");
		restockFeeText.setEditable(false);
		centerPanel.add(restockFeeText);

		centerPanel.add(totalValueLabel);
		totalValueText = new JLabel("");
		centerPanel.add(totalValueText);

		getContentPane().add(centerPanel, BorderLayout.CENTER);

		repaint();
	}


    @Override
	public void repaint() {

		Product temp = ProductInventory2.getProduct(index);

		if (temp != null) {
			nameText.setText( temp.getName() );
			stocknumberText.setText( ""+temp.getstockNumber() );
			modelText.setText( temp.getModel() );
			priceText.setText( String.format("$%.2f", temp.getPrice()) );
			unitsText.setText( ""+temp.getUnits() );
			valueText.setText( String.format("$%.2f", temp.getPrice() * temp.getUnits() ) );
			restockFeeText.setText( String.format("$%.2f", temp.getRestockFee() ) );
		}

		totalValueText.setText( String.format("$%.2f", ProductInventory2.getTotalValueOfAllInventory() ) );

	}


	public static void main(String args[])
	{

		Inventory6 Product_GUI = new Inventory6 (40);

		// Add the Nissan models
		Product_GUI.addProductToInventory2(new Product("Frontier","3", "wheels" ,14, 000.00));
		Product_GUI.addProductToInventory2(new Product("Cube", "5", "floormats" ,12, 000.00));
	        Product_GUI.addProductToInventory2(new Product("Quest", "1","radio",12,000.00));
		Product_GUI.addProductToInventory2(new Product("Rogue","3", "tires",30, 000.00));
                Product_GUI.addProductToInventory2(new Product("Armada","2", "dvdplayer",50, 000.00));


		// sort models
		Product_GUI.sortProductInventory2();

		Product_GUI.loadInventory2FromFile();


		Product_GUI.setDefaultCloseOperation( EXIT_ON_CLOSE );
		Product_GUI.pack();
		Product_GUI.setSize(700, 350);
		Product_GUI.setResizable(false);
		Product_GUI.setLocationRelativeTo( null );
		Product_GUI.setVisible(true);

		return;

	}
}  // End Inventory6 class

That worked but now it's coming up with two more errors 1: I cannot add a logo and 2: I do not know how to add a save button using the c drive

This article has been dead for over six months. Start a new discussion instead.