Looking for some help.

[booter4429]

Code:

import java.awt.*;              
import java.awt.event.*;      
import javax.swing.*;                 

public class Inventory5 {

   
    public static void main(String[] args) {


        Movie dvd = null;
        Inventory inventory = new Inventory();        

        dvd = new Movie(15035, "The Davinci Code", 18, 19.99f, 2001);
        System.out.println(dvd);
        inventory.addMovie(dvd);                    
        
        dvd = new Movie(24478, "Fight Club", 14, 20.99f, 1998);
        System.out.println(dvd);
        inventory.addMovie(dvd);                    
        
        dvd = new Movie(32059, "Ladder 49", 1, 21.99f, 1995);
        System.out.println(dvd);
        inventory.addMovie(dvd);                    

        dvd = new Movie(35989, "National Treasure", 15, 18.99f, 2003);
        inventory.addMovie(dvd);                    
        System.out.println(dvd);

        dvd = new Movie(14418, "Facing the Giants", 10, 21.99f, 2006);
        System.out.println(dvd);
        inventory.addMovie(dvd);                    
        
        dvd = new Movie(13679, "Crimson Tide", 9, 7.99f, 2005);
        System.out.println(dvd);
        System.out.println("\nEnd of DVD collection!\n");
        inventory.addMovie(dvd);                   

        inventory.printInventory();
        new InventoryGUI(inventory);                          
    } 

} 


class DVD {
    private int itemNo;
    private String title;
    private int inStock;
    private float unitPrice;

    DVD(int itemNo, String title, int inStock, float unitPrice) {
        this.itemNo    = itemNo;
        this.title     = title;
        this.inStock   = inStock;
        this.unitPrice = unitPrice;
    }

    public int getItemNo()      { return itemNo; }
    public String getTitle()    { return title; }
    public int getInStock()     { return inStock; }
    public float getUnitPrice() { return unitPrice; }

    public float value() {
        return inStock * unitPrice;
    }

    public String toString() {
        return String.format("ItemNo=%2d   Title=%-22s   InStock=%3d   Price=$%7.2f   Value=$%8.2f",
                              itemNo, title, inStock, unitPrice, value());
    }

} 


class Inventory {
   
    private final int INVENTORY_SIZE = 30;
    private DVD[] items;
    private int numItems;
     
    Inventory() {
        items = new Movie[INVENTORY_SIZE];
        numItems = 0;
    }

    public int getNumItems() {
        return numItems;
    }

    public DVD getDVD(int n) {
        return items[n];
    }

    
    public void addMovie(DVD item) {
        items[numItems] = item;    
        ++numItems;
    }


    public double value() {
        double sumOfInventory = 0.0;

        for (int i = 0; i < numItems; i++)
            sumOfInventory += items[i].value();
                        
        return sumOfInventory;
    }

    
    public void printInventory() {
        System.out.println("\nAllen's DVD Inventory\n");
       
        
        if (numItems <= 0) {
            System.out.println("Inventory is empty at the moment.\n");
        } else {
            for (int i = 0; i < numItems; i++)
                System.out.printf("%3d   %s\n", i, items[i]);
            System.out.printf("\nTotal value in inventory is $%,.2f\n\n", value());
        }
    }
    
} 



class Movie extends DVD {
    
    private int movieYear;

    
    public Movie(int MovieID, String itemName, int quantityOnHand, float itemPrice, int year) {
        super(MovieID, itemName, quantityOnHand, itemPrice);    
       
        this.movieYear = movieYear;        
    }

   
    public void setYear(int year) {
        movieYear = year;
    }

    
    public int getMovieYear() {
        return movieYear;
    }

    
     public float value() {
        return super.value() + restockingFee();
    } 

    
    public float restockingFee() {
        return super.value() * 0.05f;
    }

} 



class InventoryGUI extends JFrame 
{
    
    private Inventory theInventory; 
    
     
    private int index = 0; 
    
     
    private final JLabel itemNumberLabel = new JLabel("  Item Number:"); 
    private JTextField itemNumberText; 
    
    private final JLabel prodnameLabel = new JLabel("  Product Name:"); 
    private JTextField prodnameText; 
    
    private final JLabel prodpriceLabel = new JLabel("  Price:"); 
    private JTextField prodpriceText; 
    
    private final JLabel numinstockLabel = new JLabel("  Number in Stock:"); 
    private JTextField numinstockText; 
    
    private final JLabel valueLabel = new JLabel("  Value:"); 
    private JTextField valueText; 
    
    private final JLabel restockingFeeLabel = new JLabel("  Restocking Fee:"); 
    private JTextField restockingFeeText; 
    
    private final JLabel totalValueLabel = new JLabel("  Inventory Total Value:"); 
    private JTextField totalValueText; 

    private JPanel centerPanel;
    private JPanel buttonPanel;




     
    InventoryGUI(Inventory inventory) {
        super("Allen's Movie Inventory");
        final Dimension dim = new Dimension(140, 20);
        final FlowLayout flo = new FlowLayout(FlowLayout.LEFT);
        JPanel jp;

         
        theInventory = inventory;        
        
      
        
        
        centerPanel = new JPanel(); 
        centerPanel.setLayout(new BoxLayout(centerPanel, BoxLayout.Y_AXIS));

        buttonPanel = new JPanel();
        JButton nextButton = new JButton("Next");    
        nextButton.addActionListener(new NextButtonHandler());
        buttonPanel.add(nextButton); 
        centerPanel.add(buttonPanel);
        
        buttonPanel = new JPanel();
        JButton previousButton = new JButton("Previous");    
        previousButton.addActionListener(new PreviousHandler());
        buttonPanel.add(previousButton); 
        centerPanel.add(buttonPanel);
        
        buttonPanel = new JPanel();
        JButton firstButton = new JButton("First");    
        firstButton.addActionListener(new FirstHandler());
        buttonPanel.add(firstButton); 
        centerPanel.add(buttonPanel);
        
        buttonPanel = new JPanel();
        JButton lastButton = new JButton("Last");    
        lastButton.addActionListener(new LastHandler());
        buttonPanel.add(lastButton); 
        centerPanel.add(buttonPanel);

        jp = new JPanel(flo);
        itemNumberLabel.setPreferredSize(dim);
        jp.add(itemNumberLabel); 
        itemNumberText = new JTextField(10); 
        itemNumberText.setEditable(false); 
        jp.add(itemNumberText); 
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        prodnameLabel.setPreferredSize(dim);
        jp.add(prodnameLabel); 
        prodnameText = new JTextField(10); 
        prodnameText.setEditable(false); 
        jp.add(prodnameText); 
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        prodpriceLabel.setPreferredSize(dim);
        jp.add(prodpriceLabel); 
        prodpriceText = new JTextField(10); 
        prodpriceText.setEditable(false); 
        jp.add(prodpriceText); 
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        numinstockLabel.setPreferredSize(dim);
        jp.add(numinstockLabel); 
        numinstockText = new JTextField(10); 
        numinstockText.setEditable(false); 
        jp.add(numinstockText);  
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        restockingFeeLabel.setPreferredSize(dim);
        jp.add(restockingFeeLabel); 
        restockingFeeText = new JTextField(10); 
        restockingFeeText.setEditable(false); 
        jp.add(restockingFeeText); 
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        valueLabel.setPreferredSize(dim);
        jp.add(valueLabel); 
        valueText = new JTextField(10); 
        valueText.setEditable(false); 
        jp.add(valueText); 
        centerPanel.add(jp);
        
        
        jp = new JPanel(flo);
        totalValueLabel.setPreferredSize(dim);
        jp.add(totalValueLabel); 
        totalValueText = new JTextField(10);
        totalValueText.setEditable(false);
        jp.add(totalValueText); 
        centerPanel.add(jp);

        
        setContentPane(centerPanel);

        repaintGUI();

        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        setSize(360, 450); 
        setResizable(false); 
        setLocationRelativeTo(null); 
        setVisible(true); 
    } 

     
    public void repaintGUI() { 
        Movie temp = (Movie) theInventory.getDVD(index); 
        
        if (temp != null) { 
            itemNumberText.setText("" + temp.getItemNo());     
            prodnameText.setText(temp.getTitle()); 
            prodpriceText.setText(String.format("$%.2f", temp.getUnitPrice())); 
            restockingFeeText.setText(String.format("$%.2f", temp.restockingFee())); 
            numinstockText.setText("" + temp.getInStock()); 
            valueText.setText(String.format("$%.2f", temp.value())); 
        }
        totalValueText.setText(String.format("$%.2f", theInventory.value())); 
    }

    class NextButtonHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (++index) % numItems;
            repaintGUI();
        }
    }
   class PreviousHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (--index) % numItems;
            repaintGUI();
        }
     }
     class FirstHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (index) % numItems;
            repaintGUI();
        }
     }   
   
     class LastHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (index) % numItems;
            repaintGUI();
        }
     }
     
 

}

How do I 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.

[Eranga]

You have lots of questions here. Seems to me, first of all you have add an button. Did you do that? Later you have to think about the functionality of the button.

[Norm]

The program appears to have buttons and listeners.
If you get errors, copy and paste them here with your questions.

[booter4429]

Quote:

Originally Posted by Norm

The program appears to have buttons and listeners.
If you get errors, copy and paste them here with your questions.

I'm not getting any errors, but I don't know how to work with the first,last, and previous buttons. Any help will be grateful.

[Norm]

Quote:

how to work with the first,last, and previous buttons

First thing then is put in some println() statements to see if the listener code is being executed.
When you see that it is, then design what you want to happen when a button is pressed. Then put that code in the program.

For example: what should happen when the first button is pressed? Describe that and think what the program will have to do to do it.

[Eranga]

As Norm says, mainly you have to study about ActionListners on buttons.

Here is a simple explanation on that.

[booter4429]

Ok I have work that out now. thanks but I have one more, how do you includes a company logo.?? Anything will help...Thanks

[hardwired]

Code:

        JLabel title = new JLabel("title name");
        add(title, "North");
        add(centerPanel); // no constraint -> center section

        repaintGUI();

        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        setSize(360, 450); 
        setResizable(false); 
        setLocationRelativeTo(null); 
        setVisible(true);

[booter4429]

I'm getting some errors with this.

Exception in thread "main" java.lang.IllegalArgumentException: adding container's parent to itself
at java.awt.Container.addImpl(Container.java:1017)
at java.awt.Container.add(Container.java:935)
at javax.swing.JFrame.addImpl(JFrame.java:545)
at java.awt.Container.add(Container.java:352)
at javaapplication52.InventoryGUI.<init>(Week8.java:3 16)
at javaapplication52.Week8.main(Week8.java:47)

Here is my code....

Code:

import java.awt.*;              
import java.awt.event.*;      
import javax.swing.*;                 



public class Week8 {

   
    public static void main(String[] args) {


        Movie dvd = null;
        Inventory inventory = new Inventory();        

        dvd = new Movie(15035, "The Davinci Code", 18, 19.99f, 2001);
        System.out.println(dvd);
        inventory.addMovie(dvd);                    
        
        dvd = new Movie(24478, "Fight Club", 14, 20.99f, 1998);
        System.out.println(dvd);
        inventory.addMovie(dvd);                    
        
        dvd = new Movie(32059, "Ladder 49", 1, 21.99f, 1995);
        System.out.println(dvd);
        inventory.addMovie(dvd);                    

        dvd = new Movie(35989, "National Treasure", 15, 18.99f, 2003);
        inventory.addMovie(dvd);                    
        System.out.println(dvd);

        dvd = new Movie(14418, "Facing the Giants", 10, 21.99f, 2006);
        System.out.println(dvd);
        inventory.addMovie(dvd);                    
        
        dvd = new Movie(13679, "Crimson Tide", 9, 7.99f, 2005);
        System.out.println(dvd);
        System.out.println("\nEnd of DVD collection!\n");
        inventory.addMovie(dvd);                   

        inventory.printInventory();
        new InventoryGUI(inventory);                          
    } 

} 
class DVD {
    private int itemNo;
    private String title;
    private int inStock;
    private float unitPrice;

    DVD(int itemNo, String title, int inStock, float unitPrice) {
        this.itemNo    = itemNo;
        this.title     = title;
        this.inStock   = inStock;
        this.unitPrice = unitPrice;
    }

    public int getItemNo()      { return itemNo; }
    public String getTitle()    { return title; }
    public int getInStock()     { return inStock; }
    public float getUnitPrice() { return unitPrice; }

    public float value() {
        return inStock * unitPrice;
    }

    public String toString() {
        return String.format("ItemNo=%2d   Title=%-22s   InStock=%3d   Price=$%7.2f   Value=$%8.2f",
                              itemNo, title, inStock, unitPrice, value());
    }

} 


class Inventory {
   
    private final int INVENTORY_SIZE = 30;
    private DVD[] items;
    private int numItems;
     
    Inventory() {
        items = new Movie[INVENTORY_SIZE];
        numItems = 0;
    }

    public int getNumItems() {
        return numItems;
    }

    public DVD getDVD(int n) {
        return items[n];
    }

    
    public void addMovie(DVD item) {
        items[numItems] = item;    
        ++numItems;
    }


    public double value() {
        double sumOfInventory = 0.0;

        for (int i = 0; i < numItems; i++)
            sumOfInventory += items[i].value();
                        
        return sumOfInventory;
    }

    
    public void printInventory() {
        System.out.println("\n DVD Inventory\n");
       
        
        if (numItems <= 0) {
            System.out.println("Inventory is empty at the moment.\n");
        } else {
            for (int i = 0; i < numItems; i++)
                System.out.printf("%3d   %s\n", i, items[i]);
            System.out.printf("\nTotal value in inventory is $%,.2f\n\n", value());
        }
    }
    
} 



class Movie extends DVD {
    
    private int movieYear;

    
    public Movie(int MovieID, String itemName, int quantityOnHand, float itemPrice, int year) {
        super(MovieID, itemName, quantityOnHand, itemPrice);    
       
        this.movieYear = movieYear;        
    }

   
    public void setYear(int year) {
        movieYear = year;
    }

    
    public int getMovieYear() {
        return movieYear;
    }

    
     public float value() {
        return super.value() + restockingFee();
    } 

    
    public float restockingFee() {
        return super.value() * 0.05f;
    }

} 




class InventoryGUI extends JFrame 
{
   
    
    private Inventory theInventory; 
    
     
    private int index = 0; 
    
     
    private final JLabel itemNumberLabel = new JLabel("  Item Number:"); 
    private JTextField itemNumberText; 
    
    private final JLabel prodnameLabel = new JLabel("  Product Name:"); 
    private JTextField prodnameText; 
    
    private final JLabel prodpriceLabel = new JLabel("  Price:"); 
    private JTextField prodpriceText; 
    
    private final JLabel numinstockLabel = new JLabel("  Number in Stock:"); 
    private JTextField numinstockText; 
    
    private final JLabel valueLabel = new JLabel("  Value:"); 
    private JTextField valueText; 
    
    private final JLabel restockingFeeLabel = new JLabel("  Restocking Fee:"); 
    private JTextField restockingFeeText; 
    
    private final JLabel totalValueLabel = new JLabel("  Inventory Total Value:"); 
    private JTextField totalValueText; 

    private JPanel centerPanel;
    private JPanel buttonPanel;




     
    InventoryGUI(Inventory inventory) {
        super(" Movie Inventory");
        final Dimension dim = new Dimension(140, 20);
        final FlowLayout flo = new FlowLayout(FlowLayout.LEFT);
        JPanel jp;

         
        theInventory = inventory;        
        
        
        
        centerPanel = new JPanel(); 
        centerPanel.setLayout(new BoxLayout(centerPanel, BoxLayout.Y_AXIS));

        buttonPanel = new JPanel();
        JButton nextButton = new JButton("Next");    
        nextButton.addActionListener(new NextButtonHandler());
        buttonPanel.add(nextButton); 
        centerPanel.add(buttonPanel);
        
        buttonPanel = new JPanel();
        JButton previousButton = new JButton("Previous");    
        previousButton.addActionListener(new PreviousHandler());
        buttonPanel.add(previousButton); 
        centerPanel.add(buttonPanel);
        
        buttonPanel = new JPanel();
        JButton firstButton = new JButton("First");    
        firstButton.addActionListener(new FirstHandler());
        buttonPanel.add(firstButton); 
        centerPanel.add(buttonPanel);
        
        buttonPanel = new JPanel();
        JButton lastButton = new JButton("Last");    
        lastButton.addActionListener(new LastHandler());
        buttonPanel.add(lastButton); 
        centerPanel.add(buttonPanel);

        jp = new JPanel(flo);
        itemNumberLabel.setPreferredSize(dim);
        jp.add(itemNumberLabel); 
        itemNumberText = new JTextField(10); 
        itemNumberText.setEditable(false); 
        jp.add(itemNumberText); 
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        prodnameLabel.setPreferredSize(dim);
        jp.add(prodnameLabel); 
        prodnameText = new JTextField(10); 
        prodnameText.setEditable(false); 
        jp.add(prodnameText); 
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        prodpriceLabel.setPreferredSize(dim);
        jp.add(prodpriceLabel); 
        prodpriceText = new JTextField(10); 
        prodpriceText.setEditable(false); 
        jp.add(prodpriceText); 
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        numinstockLabel.setPreferredSize(dim);
        jp.add(numinstockLabel); 
        numinstockText = new JTextField(10); 
        numinstockText.setEditable(false); 
        jp.add(numinstockText);  
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        restockingFeeLabel.setPreferredSize(dim);
        jp.add(restockingFeeLabel); 
        restockingFeeText = new JTextField(10); 
        restockingFeeText.setEditable(false); 
        jp.add(restockingFeeText); 
        centerPanel.add(jp);
        
        jp = new JPanel(flo);
        valueLabel.setPreferredSize(dim);
        jp.add(valueLabel); 
        valueText = new JTextField(10); 
        valueText.setEditable(false); 
        jp.add(valueText); 
        centerPanel.add(jp);
        
        
        jp = new JPanel(flo);
        totalValueLabel.setPreferredSize(dim);
        jp.add(totalValueLabel); 
        totalValueText = new JTextField(10);
        totalValueText.setEditable(false);
        jp.add(totalValueText); 
        centerPanel.add(jp);

        
        setContentPane(centerPanel);

        repaintGUI();

        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        setSize(360, 450); 
        setResizable(false); 
        setLocationRelativeTo(null); 
        setVisible(true); 
    
        JLabel title = new JLabel("title name");
        add(title, "North");
        add(centerPanel); // no constraint -> center section

        repaintGUI();

        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        setSize(360, 450); 
        setResizable(false); 
        setLocationRelativeTo(null); 
        setVisible(true);
    } 

     
    public void repaintGUI() { 
        Movie temp = (Movie) theInventory.getDVD(index); 
        
        if (temp != null) { 
            itemNumberText.setText("" + temp.getItemNo());     
            prodnameText.setText(temp.getTitle()); 
            prodpriceText.setText(String.format("$%.2f", temp.getUnitPrice())); 
            restockingFeeText.setText(String.format("$%.2f", temp.restockingFee())); 
            numinstockText.setText("" + temp.getInStock()); 
            valueText.setText(String.format("$%.2f", temp.value())); 
        }
        totalValueText.setText(String.format("$%.2f", theInventory.value())); 
    }

    class NextButtonHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (++index) % numItems;
            repaintGUI();
        }
    }
   class PreviousHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (index-1) % numItems;
            repaintGUI();  
        }
     }
     class FirstHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (index=0) % numItems;
            repaintGUI();
        }
     }   
   
     class LastHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (index=5) % numItems;
            repaintGUI();
        }
     }
     
}

[Norm]

Quote:

at javaapplication52.InventoryGUI.<init>(Week8.java:3 16)

Look at the source at line 316 in the InventoryGUI constructor.

Its very hard to see where that line is from your posting.

[booter4429]

JLabel title = new JLabel("title name");
add(title, "North");
add(centerPanel);// this is line 316

[Norm]

Quote:

adding container's parent to itself

How is centerPanel related to the container it is being added to?

[hardwired]

Looks like you did copy and paste without thinking about what changes you wanted/should make.
IllegalArgumentException: adding container's parent to itself
You've already set "centerPanel" as the contentPane:

Code:

        setContentPane(centerPanel);

Then you come along and try to add "centerPanel" to the center section of the contentPane (which is "centerPanel"):

Code:

        JLabel title = new JLabel("title name");
        add(title, "North");
        add(centerPanel); // no constraint -> center section

So change this

Code:

        ...
        jp = new JPanel(flo);
        totalValueLabel.setPreferredSize(dim);
        jp.add(totalValueLabel); 
        totalValueText = new JTextField(10);
        totalValueText.setEditable(false);
        jp.add(totalValueText); 
        centerPanel.add(jp);

        
        setContentPane(centerPanel);

        repaintGUI();

        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        setSize(360, 450); 
        setResizable(false); 
        setLocationRelativeTo(null); 
        setVisible(true); 
    
        JLabel title = new JLabel("title name");
        add(title, "North");
        add(centerPanel); // no constraint -> center section

        repaintGUI();

        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        setSize(360, 450); 
        setResizable(false); 
        setLocationRelativeTo(null); 
        setVisible(true);
    }

to this

Code:

        ...
        jp = new JPanel(flo);
        totalValueLabel.setPreferredSize(dim);
        jp.add(totalValueLabel); 
        totalValueText = new JTextField(10);
        totalValueText.setEditable(false);
        jp.add(totalValueText); 
        centerPanel.add(jp);

        JLabel title = new JLabel("title name");
        add(title, "North");
        add(centerPanel); // no constraint -> center section

        repaintGUI();

        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        setSize(360, 450); 
        setResizable(false); 
        setLocationRelativeTo(null); 
        setVisible(true);
    }

[booter4429]

Ok I got it. Thanks

Last thing. How do I get this to work? It needs to go back and keep going back. But if I get the the 1st on I get an error.

Code:

 class PreviousHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int numItems = theInventory.getNumItems();
            index = (index-1) % numItems;
            repaintGUI();  
        }
     }

[hardwired]

Code:

        int x = 4;
        int countUp = 0;
        int countDown = x;
        for(int i = 0; i < 6; i++) {
            countUp = (countUp+1) % x;
            countDown = countDown -1;
            if(countDown < 0)
                countDown = x;
            System.out.printf("countUp = %d  countDown = %d%n",
                               countUp, countDown);
        }