GUI array information cycler help please

I currently have a program that has 3 classes. Basically one class is the main and has some information hard coded that it submits to one of the other classes. The second class takes that information, formats it and sends it to the third class. The third class creates an array, takes the information from the second class and has a display method that the main can call to display the information.

The program basically spews out all the information in the array in a specific format. The array elements contain strings, ints and doubles. The third class also calculates some things that are displayed with the display method in main.

What I need to do is create a third class. This class needs to make a GUI to display the information. I currently have the programs display method display the information in a GUI but I need it to display each element one at a time with a NEXT and PREVIOUS button. The next button needs to go to the next array element and the previous button obviously needs to go back to the array element.

Here is the code.

// Inventory Program

// Created June 20, 2007

import java.util.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

publicclass Inventory4{

publicstaticvoid main(String[] args){

CD cd;

Inventory inventory =new Inventory();

cd =new CDWithGenre(16,"Disney Hits", 11, 13.01f,"Soundtrack");

inventory.add(cd);

cd =new CDWithGenre(12,"The Clash", 10, 19.99f,"Classic Rock");

inventory.add(cd);

cd =new CDWithGenre(45,"Dixie Chiks", 18, 10.87f,"Country");

inventory.add(cd);

cd =new CDWithGenre(32,"The Cure", 62, 25.76f,"Alternative");

inventory.add(cd);

cd =new CDWithGenre(18,"MS Office", 27, 99.27f,"None");

inventory.add(cd);

inventory.display();

}//End main method

}//End Inventory4 class

/* Defines data from main as CD data and formats it. Calculates value of a title multiplied by its stock.

Creates compareTo method to be used by Arrays.sort when sorting in alphabetical order. */

class CDimplements Comparable{

//Declares the variables as protected so only this class and subclasses can act on them

protectedint cdSku;

protected String cdName;

protectedint cdCopies;

protecteddouble cdPrice;

protected String genre;

//Constructor

CD(int cdSku, String cdName,int cdCopies,double cdPrice, String genre){

this.cdSku= cdSku;

this.cdName= cdName;

this.cdCopies = cdCopies;

this.cdPrice = cdPrice;

this.genre = genre;

}

// This method tells the sort method what is to be sorted

publicint compareTo(Object o)

{

return cdName.compareTo(((CD) o).getName());

}

// Calculates the total value of the copies of a CD

publicdouble totalValue(){

return cdCopies * cdPrice;

}

// Tells the caller the title

public String getName(){

return cdName;

}

//Displays the information stored by the constructor

public String toString(){

return String.format("SKU=%2dName=%-20sStock=%3dPrice=$%6.2fValue=$%,8.2f",

cdSku, cdName, cdCopies, cdPrice, totalValue());

}

}// end CD class

//Class used to add items to the inventory, display output for the inventory and sort the inventory

class Inventory{

private CD[] cds;

privateint nCount;

// Creates array cds[] with 10 element spaces

Inventory(){

cds =new CD[10];

nCount = 0;

}

// Used by main to input a CD object into the array cds[]

publicvoid add(CD cd){

cds[nCount] = cd;

++nCount;

sort();

}

//Displays the arrays contents element by element into a GUI pane

publicvoid display(){

JTextArea textArea =new JTextArea();

textArea.append("\nThere are " + nCount +" CD titles in the collection\n\n");

for (int i = 0; i < nCount; i++)

textArea.append(cds[i]+"\n");

textArea.append("\nTotal value of the inventory is "+new java.text.DecimalFormat("$0.00").format(totalValue())+"\n\n");

JFrame invFrame =new JFrame();

invFrame.getContentPane().add(new JScrollPane(textArea));

invFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

invFrame.pack();

invFrame.setLocationRelativeTo(null);

invFrame.setVisible(true);

}

// Steps through the array adding the totalValue for each CD to "total"

publicdouble totalValue(){

double total = 0;

double restock = 0;

for (int i = 0; i < nCount; i++)

total += cds[i].totalValue();

return total;

}

//Method used to sort the array by the the name of the CD

privatevoid sort(){

Arrays.sort(cds, 0, nCount);

}

}// end Inventory class

// Subclass of CD. Creates new output string to be used, adds a restocking fee calculation and genre catagory to be displayed.

class CDWithGenreextends CD{

String genre;

CDWithGenre(int cdSku, String cdName,int cdCopies,double cdPrice, String genre){

super(cdSku, cdName, cdCopies, cdPrice, genre);

this.cdName= cdName;

this.cdCopies = cdCopies;

this.cdPrice = cdPrice;

this.genre = genre;

}

// Calculates restocking fee based on previous data.

publicdouble restockFee(){

double total = 0;

double restock = 0;

total = cdCopies * cdPrice;

restock = total * .05;

return restock;

}

// New output method overrides superclass's output method with new data and format.

public String toString(){

return String.format("SKU: %2dGenre: %-12sName: %-20s\nPrice: $%6.2fValue: $%,8.2fStock: %3d Restocking Fee: $%6.2f\n",

cdSku, genre , cdName, cdPrice, totalValue(), cdCopies, restockFee());

}

}// Ends CDWithGenre class

[10652 byte] By [Codigoa] at [2007-11-27 8:35:34]

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GUI array information cycler help please

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