Need Help With Shell Programming

Hi, I need some guidance as to how to approach my project.
I need to develop a shell to host an e-learning environment that can be accessed through the internet. The user, preferably, needs not to download anything to run/start the e-learning environment. This e-learning environment allows users/students to create a forum, create a chatroom, hand up projects, send mail, do surveys and tutorials online and these can be submitted to the teacher/marker and receive feedback and also view their grades and schedule. Eg, Blackboard http://www.blackboard.com/
The problem is is that there seems to be no shell programming by using java. I have found only shell programming using UNIX, korn and C. I read other posts in the forums here concerning shell programming and alot of the codes include the first 2 lines :
Runtime rt = Runtime.getRuntime();      
String command = "your_shell_script_command";      
try {           
      Process process = rt.exec(command);           
     from = new BufferedReader(new InputStreamReader(process.getInputStream()));           
     to = new PrintWriter(process.getOutputStream(), true);      
catch (IOException e) {         ...       }the above codes were taken from this post: http://forum.java.sun.com/thread.jsp?forum=57&thread=352231
Does it means that I need to use another language besides Java to program a shell and then run it together with my java program? If so, what language do I need to learn and what Java "component" do I need to use? and is it possible to run a shell in an applet, since the applet is viewable through a browser?
I really need some help on this problem as I don't have a clue to go about it at all. Thanks in advance.

er, actually the applet does not seem to load at all.
But from what you have written, yeah, I need to
process the user's input and in my case, his
selected/choosen options in a menu.
E.g, the user wants to create a forum, he/she chooses
the create forum option from the menu which is part of
the shell and something happens which allows the user
to customise the forum.
So, let me get this straight, I can create an applet
and run the shell on the applet and the user can view
this application without downloading anything? As YAT said...providing they have the java plugin...yes... if you keep it to java.applet.Applet (AWT) and not JApplet, you should even have more users able to run it without 'downloading' anything..
Now..to be clear... they ARE downloading your .class files, and running them within a JVM on their own local machine... But they will not need anything (assuming their browser supports the Java version you write in) else...

Similar Messages

  • Need help with inventory program!!! someone please help me!!!

    Ok I have to write this inventory program for one of my classes.
    For part one i needed to Create a product class that holds the item number, the name of product, the number of units in stock, and the price of each unit.
    Then create a java application that displays all of the above info plus the total value of the inventory. I have done this so far with success.
    For part two i needed to modify the program so the application can handle multiple items. Use an array to store the items. The output 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 per unit, and the value of the inventory of that product. In addition, the output should display the value of the entire inventory.
    so create a method to calculate the value of the entire inventory.(i did this)
    and create another method to sort the array items by the name of the product. ( i did this)
    The program compiles and runs fine except it is not doing anything from part two. It just does the same thing that it did when i wrote part one.
    Does anyone know why or what i need to do to my code.
    Here is my code.
    import java.util.Scanner; // program uses class Scanner
    import java.util.Arrays;
    class ProductList
      Product[] products = new Product[100]; // an array of 100 pruducts
      private void populate() {
        products[0] = new Product(0, "Good Luck Chuck"      , 25, 4.95);
        products[1] = new Product(1, "The Bourne Identity"  ,  3, 7.95);
        products[2] = new Product(2, "The Reaping"          ,  5, 8.99);
          products[3] = new Product(3, "Deja Vu"              ,  2,12.99);
          products[4] = new Product(4, "I Know Who Killed Me" ,  3,10.95);
      private void sortByTitle() {
      private void print() {
        for(int i=0; i<products.length; i++) {
          System.out.println(products);
    private void printTotalInventoryValue() {
    System.out.println("Total Inventory Value = "+calculateTotalInventoryValue());
    private double calculateTotalInventoryValue() {
    double total = 0D;
    for(int i=0; i<products.length; i++) {
    total += products[i].calculateInventoryValue();
    return total;
    public static void main( String args[] ) {
    ProductList list = new ProductList();
    list.populate();
    list.sortByTitle();
    list.print();
    list.printTotalInventoryValue();
    } class Product
    private int id;
    private String title;
    private int stock;
    private double price;
    public Product(int id, String title, int stock, double price) {
    setId(id);
    setTitle(title);
    setStock(stock);
    setPrice(price);
    public int getId() { return this.id; }
    public void setId(int id) { this.id = id; }
    public String getTitle() { return this.title; }
    public void setTitle(String title) { this.title = title; }
    public int getStock() { return this.stock; }
    public void setStock(int stock) { this.stock = stock; }
    public double getPrice() { return this.price; }
    public void setPrice(double price) { this.price = price; }
    public double calculateInventoryValue() {
    return getStock() * getPrice();
    public class Inventorypt2
    private String ProductInfo; // call class product info
    public static void main(String args[])
    //create Scanner to obtain input from command window
    Scanner input = new Scanner( System.in );
    int num; // product's item number
    int stock; // number of items in stock
    double price; // price each of item
    ProductInfo product; // product information instance
    System.out.println(); // blank line
    String name = "go";
    // loop until sentinel value read from user
    while ( !name.equalsIgnoreCase ("stop") )
    System.out.print( "Enter DVD title, or STOP to quit: "); // prompt
    name = input.nextLine(); // read item name from user or quit
    System.out.print( "Enter the item number: "); // prompt
    num = input.nextInt(); // read item number from user
    while ( num <=0 ) //loop until item number is positive
    System.out.println ("Item number must be positive. Please re-enter item number: ");//prompt user to re-enter item number
    num = input.nextInt(); // read item number
    } //end while
    System.out.print( "Enter the quantity in stock: "); // prompt
    stock = input.nextInt(); // read stock quantity from user
    while ( stock <0 ) //loop until stock is positive
    System.out.println ("Quantity in stock can not be less than zero. Please re-enter the quantity in stock: ");//prompt user to re-enter quantity in stock
    stock = input.nextInt(); // read stock quantity from user
    } //end while
    System.out.print( "Enter the price of DVD: "); // prompt
    price = input.nextDouble(); // read item price from user
    while ( price <=0 ) //loop until price is positive
    System.out.println ("Product price must be positive. Please re-enter the price of the product: ");//prompt user to re-enter product price
    price = input.nextDouble(); // read item price from user
    } //end while
    product = new ProductInfo( num, name, stock, price); // initialize ProductInfo variables
    System.out.println(); // blank line
    System.out.printf( "Item Name: %S\n", product.getName());
    System.out.printf( "Item Number: %s\n", product.getNum());
    System.out.printf( "Qty. in Stock: %s\n", product.getStock());
    System.out.printf( "Price Each: $%.2f\n", product.getPrice());
    System.out.printf( "Total Value in Stock: $%.2f\n", product.getInventoryTotal());
    System.out.println(); // blank line
    System.out.print( "Enter DVD title, or STOP to quit: "); // prompt
    name = "";
    while ( name.equals("") )
    name = input.nextLine(); // read new product name from user or quit
    } //end while
    System.out.println(); // blank line
    System.out.println("Good Bye!"); // exit message
    Edited by: jay1981 on Mar 16, 2008 2:07 PM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

    You will get more help if your code is formatted better:
    * Only post code that is already formatted correctly including indentations.
    * Get rid of all those comments cluttering up your code.
    * Make sure your posted code compiles without need for any changes. Yours doesn't at present. Where is the ProductInfo class?
    Again, you want it easy for a volunteer here to read your post, otherwise he/she simply won't do it. Good luck.

  • Need help with basic program.....!

    I've to write a program that generates a random number, which the user has to try and guess, after each guess they're told whether it's too high or too low etc., I've gotten this far, however, the user has only 10 guesses.... In my program I've used a while loop and the user gets an infinite number of guesses, I know I'm supposed to use a for loop, but can't seem to get it to work properly. Also, when the user guesses the number, the program then has to print out how many guesses it took, and I have no idea how to get it to do this AT ALL!!! I'd really appreciate some help with this, thanks v. much!!!!

    I've to write a program that generates a random
    number, which the user has to try and guess, after
    each guess they're told whether it's too high or too
    low etc., I've gotten this far, however, the user has
    only 10 guesses.... In my program I've used a while
    loop and the user gets an infinite number of guesses,
    I know I'm supposed to use a for loop, but can't seem
    to get it to work properly. Also, when the user
    guesses the number, the program then has to print out
    how many guesses it took, and I have no idea how to
    get it to do this AT ALL!!! I'd really appreciate some
    help with this, thanks v. much!!!!Hey not every book covers every aspect of Java (if you haven't got a book and don't want to buy 1 i recommend an online tutorial) If u want the user to have an infinate number of guesses, use an infinate while loop. Put this in a file called app.java:
    import java.applet.Applet;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    public class app extends Applet implements ActionListener
         JLabel lbl=new JLabel("Guess a number between 0 and 10:");
         JTextField txtfield=new JTextField(20);
         JButton button=new JButton("Guess...");
         JLabel lbl2=new JLabel();
         int randomnumber=Math.round((float)Math.random()*10);
         public void init()
              add(lbl);
              add(txtfield);
              add(button);
              button.addActionListener(this);
         public void actionPerformed (ActionEvent e)
              String s=new String("");
              s+=randomnumber;
              if (e.getSource().equals(button) && txtfield.getText().equals(s))
                   setBackground(Color.white);
                   setForeground(Color.black);
                   lbl2.setText("Got it!");
                   add(lbl2);
                   validate();
              else
                   setBackground(Color.white);
                   setForeground(Color.black);
                   if (Integer.parseInt(txtfield.getText())>randomnumber)
                   lbl2.setText("Too High!");
                   else
                   lbl2.setText("Too Low!");
                   add(lbl2);
                   validate();
    Then create a HTML document in the classes folder:
    <HTML>
    <HEAD>
    <TITLE>APPLET</TITLE>
    </HEAD>
    <BODY>
    <HR>
    <CENTER>
    <APPLET
         CODE=app.class
         WIDTH=400
         HEIGHT=200 >
    </APPLET>
    </CENTER>
    <HR>
    </BODY>
    </HTML>
    It will do what you wish. If you want to have more then 10 numbers to guess, for example 100, do this:
    int randomnumber=Math.round((float)Math.random()*100);
    Does that answer your question?

  • I also need help with a programming assingment. I think I'm almost there!

    I have the following assingment to complete:Once again, you realize that you need to upgrade your Java program with two more features:
    Be able to print products which are �On Sale�.
    Use arrays to store the product names so that you can keep track of your inventory.
    After some analysis, you notice that printing the products can be achieved by modifying the two classes you have already written. One approach would be to add a Boolean attribute called �OnSale� to the ToddlerToy and add a print method that print information about a product indicating if it is �On Sale�.
    Update your constructor, taking into account the �On Sale� attribute.
    Create two more instances: a small train called Train4 and a big train called Train5. Mark both trains �On Sale�
    Add another method that prints the sale information
    Keeping track of the names of products can be achieved by declaring an array of strings in the ToysManager class itself. Each time a new product is created, it is also added to the array. Use a while construct to print the product names in your inventory.
    This is the code I have come up with:
    public class ToysManager {
         private String toyInventory[] = {"Big Train","Small Train"};
         public void printInventory() {
         System.out.println("List of Items in Toy Inventory");
         for (int i=0; i<toyInventory.length; i++)
         { System.out.println(toyInventory[i])); } // ";"expected - ToysManager.java
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              //System.out.println("This is the main method of class ToysManager.");
              //call on ToysManager printInventory method for a listing of all toy types
              printInventory();
              // Create ToddlerToy Objects Train1,Train2,Train3,Train4,Train5
         ToddlerToy Train1 = new ToddlerToy(489, "Big Train", 19.95,false);
         Train1.printOnSale();
         ToddlerToy Train2 = new ToddlerToy(489, "Big Train", 19.95,false);
         Train2.printOnSale();
         ToddlerToy Train3 = new ToddlerToy(477, "Small Train", 12.95,false);
         Train3.printOnSale();
         ToddlerToy Train4 = new ToddlerToy(477, "Small Train", 12.95,true);
         Train4.printOnSale();
         ToddlerToy Train5 = new ToddlerToy(489, "Big Train", 19.95,true);
         Train5.printOnSale();
    }     //this is the end bracket for the main method
    }          //this is the end bracket for the ToysManager class
    class ToddlerToy {
         // Initialize and Assign Data Types to each Variables
         private int productID;
         public String productName;
         public double productPrice;
         private boolean onSale;
    public void ToddlerToy(int a, String b, double c, boolean d) {
         // Assign Data to Variables
         productID = a;
         productName = b;
         productPrice = c;
         onSale = d;
         //PrintProductPrice(ProductPrice);
         } //end of constructor
    public void printOnSale(){
         if(onSale == true) System.out.println("This item #" + productID + ": " + productName + "is on sale");
    I don't have any problems with class ToddlerToy. I can compile that with no problems. I'm having issues with public class ToysManager. I can't compile that one correctly. It fails at:
    { System.out.println(toyInventory[i])); } // ";"expected - ToysManager.java
    I've looked through the java books I have and also online, but I can't figure this out. I'm new to java so any help would be appreciated.
    Thanks in advance.

    Thanks. That got me past that error. I was hung up on that for far too long. I made some changes and when i compile the ToysManager class it shoots a different error. The code now looks like this:
    public class ToysManager {
         private String toyInventory[] = {"Big Train","Small Train"};
         public void printInventory() {
         System.out.println("List of Items in Toy Inventory");
         for (int i=0; i<toyInventory.length; i++){
         System.out.println(toyInventory);
         public static void main(String[] args) {
              //System.out.println("This is the main method of class ToysManager.");
              //call on ToysManager printInventory method for a listing of all toy types
              printInventory();
              // Create ToddlerToy Objects Train1,Train2,Train3,Train4,Train5
         ToddlerToy Train1 = new ToddlerToy(489, "Big Train", 19.95,false);
         Train1.printOnSale();
         ToddlerToy Train2 = new ToddlerToy(489, "Big Train", 19.95,false);
         Train2.printOnSale();
         ToddlerToy Train3 = new ToddlerToy(477, "Small Train", 12.95,false);
         Train3.printOnSale();
         ToddlerToy Train4 = new ToddlerToy(477, "Small Train", 12.95,true);
         Train4.printOnSale();
         ToddlerToy Train5 = new ToddlerToy(489, "Big Train", 19.95,true);
         Train5.printOnSale();
         }     //this is the end bracket for the main method
    }          //this is the end bracket for the ToysManager class
    I get an illegal start of expression for:
         public static void main(String[] args) {
    and ";" expected for:
         }     //this is the end bracket for the main method
    I looked over my initial code, before the "for" loop?, and the public static void main was a valid statement.

  • Need help with inverter program

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    Attachments:
    main2.vi ‏162 KB

    Hello Tony,
    you programmed it to run continously...
    After the timed while loop runs through your array of ramp values you start again at index 0 (upper shift register). Instead of this end this while loop by combining the output from the comparison with your stop2 button (end loop when stop2 OR end of arrray). Now it will work.
    Btw. why do you use "Insert to Array" when you want to concat 3 arrays (sequence frame 0)? Just use a "Build Array" and set "Concat Inputs" via mouse right-click.
    Best regards,
    GerdW
    Best regards,
    GerdW
    CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
    Kudos are welcome

  • New to Java and need help with this program..please!

    I'd really appreciate any helpful comments about this program assignment that I have to turn in a week from Friday. I'm taking a class one night a week and completely new to Java. I'd ask my professor for help, but we can't call him during the week and he never answers e-mails. He didn't tell us how to call from other classes yet, and I just can't get the darn thing to do what I want it to do!
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    import javax.swing.*;
    import java.text.*;
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    int j;
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    I don't know how to go about making and calling a method or class that will combine the total cards delt to the player and the total cards delt to the dealer. The rank() method only seems to give me the last cards drawn to compare with when I try to do the tests.**/
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    || (mine.rank() > 21)
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    || ((dealer.rank() == 21)
    && (mine.rank() == 21))
    || ((mine.rank() > 21)
    && (dealer.rank() <= 21)))
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    wins++;
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    break;
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    break;
    if (rounds == 5)
    System.out.println("Player wins " +
    (CardDeck.rounds - wins) + "rounds");
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    private Card[] deck;
    private int cards;
    public static int rounds = 1;
    public int cardValue;
    /**When I try to compile this nested class, I get an error message saying I need a brace here and at the end of the program. I don't know if any of this code would work because I've tried adding braces and still can't compile it.**/
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    static int r = 1;
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    public int getRounds() { return r++; }
    final class Card
    public static final int ACE = 1;
    public static final int JACK = 11;
    public static final int QUEEN = 12;
    public static final int KING = 13;
    public static final int CLUBS = 1;
    public static final int DIAMONDS = 2;
    public static final int HEARTS = 3;
    public static final int SPADES = 4;
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    else if (value == QUEEN)
    v = "Queen";
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    if (suit == DIAMONDS)
    s = "Diamonds";
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    s = "Hearts";
    else if (suit == SPADES)
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    private int value; //Value is an integer, so how can a
    private int suit; //string be assigned to an integer?
    }

    Thank you so much for offering to help me with this Jamie! When I tried to call change value using:
    Card dealer = (d.changeValue());
    I get an error message saying:
    Incompatible types found: int
    required: Card
    I had my weekly class last night and the professor cleared up a few things for me, but I've not had time to make all of the necessary changes. I did find out how toString worked, so that's one question out of the way, and he gave us a lot of information for adding another class to generate random numbers.
    Again, thank you so much. I really want to learn this but I'm feeling so stupid right now. Any help you can give me about the above error message would be appreciated.

  • Need help with Java programming installation question

    Sorry for my lack of knowledge about Java programming, but:....
    A while back I thought I had updated my Java Runtime Environment programming. But I now apparently have two programs installed, perhaps through my not handling the installation properly. Those are:
    J2SE Runtime Environment 5.0 update 5.0 (a 118MB file)
    and:
    Java 2 Runtime Environment, SE v 1.4.2_05 (a 108MB file)
    Do I need both of these installed? If not, which should I uninstall?
    Or, should I just leave it alone, and not worry about it?
    Yeah, I don't have much in the way of technical knowledge...
    Any help or advice would be appreciated. Thank you.
    Bob VanHorst

    Thanks for the feedback. I think I'll do just that. Once in a while I have a problem with Java not bringing up a webcam shot, but when that happens, it seems to be more website based than a general condition.

  • Need help with shell scripting and Patching

    Hello all,
    I am a very new Oracle DBA and I just have an interview where i have been ask two questions that i have no idea of what it is
    1/ What is shell scripting and how do you do shell scripting?
    2/ What is Patching and how do you do patching?
    Can some one help to have a very good understanding of these tow questions?
    Thanks a lot

    1/ What is shell scripting and how do you do shell scripting?shell accept command from you (via keyboard) and execute them. But if you use command one by one (sequence of 'n' number of commands) , the you can store this sequence of command to text file and tell the shell to execute this text file instead of entering the commands. This is know as shell script.
    Shell script defined as:
    "Shell Script is series of command written in plain text file. Shell script is just like batch file in MS-DOS
    for example:- for taking backup, health check and doing some task Operating system level or Oracle database level we can create shell script and schedule a cron job
    2/ What is Patching and how do you do patching?for example ,in windows while using sometimes you might face an issue/error and it gives pop up error message would like to send/report this error to microsoft? microsoft will send you a fix for that. lot of fixes for errors/bugs are released as patches.( n number of patches with newer features are releases as new version)
    likewise in oracle for resolving bugs we should have to apply patch.
    patch is basically a fix for a bug/bugs. we need to use opatch utility to apply the paches.
    hope, this helps you

  • I need help with this program ( Calculating Pi using random numbers)

    hi
    please understand that I am not trying to ask anymore to do this hw for me. I am new to java and working on the assignment. below is the specification of this program:
    Calculate PI using Random Numbers
    In geometry the ratio of the circumference of a circle to its diameter is known as �. The value of � can be estimated from an infinite series of the form:
    � / 4 = 1 - (1/3) + (1/5) - (1/7) + (1/9) - (1/11) + ...
    There is another novel approach to calculate �. Imagine that you have a dart board that is 2 units square. It inscribes a circle of unit radius. The center of the circle coincides with the center of the square. Now imagine that you throw darts at that dart board randomly. Then the ratio of the number of darts that fall within the circle to the total number of darts thrown is the same as the ratio of the area of the circle to the area of the square dart board. The area of a circle with unit radius is just � square unit. The area of the dart board is 4 square units. The ratio of the area of the circle to the area of the square is � / 4.
    To simuluate the throwing of darts we will use a random number generator. The Math class has a random() method that can be used. This method returns random numbers between 0.0 (inclusive) to 1.0 (exclusive). There is an even better random number generator that is provided the Random class. We will first create a Random object called randomGen. This random number generator needs a seed to get started. We will read the time from the System clock and use that as our seed.
    Random randomGen = new Random ( System.currentTimeMillis() );
    Imagine that the square dart board has a coordinate system attached to it. The upper right corner has coordinates ( 1.0, 1.0) and the lower left corner has coordinates ( -1.0, -1.0 ). It has sides that are 2 units long and its center (as well as the center of the inscribed circle) is at the origin.
    A random point inside the dart board can be specified by its x and y coordinates. These values are generated using the random number generator. There is a method nextDouble() that will return a double between 0.0 (inclusive) and 1.0 (exclusive). But we need random numbers between -1.0 and +1.0. The way we achieve that is:
    double xPos = (randomGen.nextDouble()) * 2 - 1.0;
    double yPos = (randomGen.nextDouble()) * 2 - 1.0;
    To determine if a point is inside the circle its distance from the center of the circle must be less than the radius of the circle. The distance of a point with coordinates ( xPos, yPos ) from the center is Math.sqrt ( xPos * xPos + yPos * yPos ). The radius of the circle is 1 unit.
    The class that you will be writing will be called CalculatePI. It will have the following structure:
    import java.util.*;
    public class CalculatePI
    public static boolean isInside ( double xPos, double yPos )
    public static double computePI ( int numThrows )
    public static void main ( String[] args )
    In your method main() you want to experiment and see if the accuracy of PI increases with the number of throws on the dartboard. You will compare your result with the value given by Math.PI. The quantity Difference in the output is your calculated value of PI minus Math.PI. Use the following number of throws to run your experiment - 100, 1000, 10,000, and 100,000. You will call the method computePI() with these numbers as input parameters. Your output will be of the following form:
    Computation of PI using Random Numbers
    Number of throws = 100, Computed PI = ..., Difference = ...
    Number of throws = 1000, Computed PI = ..., Difference = ...
    Number of throws = 10000, Computed PI = ..., Difference = ...
    Number of throws = 100000, Computed PI = ..., Difference = ...
    * Difference = Computed PI - Math.PI
    In the method computePI() you will simulate the throw of a dart by generating random numbers for the x and y coordinates. You will call the method isInside() to determine if the point is inside the circle or not. This you will do as many times as specified by the number of throws. You will keep a count of the number of times a dart landed inside the circle. That figure divided by the total number of throws is the ratio � / 4. The method computePI() will return the computed value of PI.
    and below is what i have so far:
    import java.util.*;
    public class CalculatePI
      public static boolean isInside ( double xPos, double yPos )
         double distance = Math.sqrt( xPos * xPos + yPos * yPos );        
      public static double computePI ( int numThrows )
        Random randomGen = new Random ( System.currentTimeMillis() );
        double xPos = (randomGen.nextDouble()) * 2 - 1.0;
        double yPos = (randomGen.nextDouble()) * 2 - 1.0;
        int hits = 0;
        int darts = 0;
        int i = 0;
        int areaSquare = 4 ;
        while (i <= numThrows)
            if (distance< 1)
                hits = hits + 1;
            if (distance <= areaSquare)
                darts = darts + 1;
            double PI = 4 * ( hits / darts );       
            i = i+1;
      public static void main ( String[] args )
        Scanner sc = new Scanner (System.in);
        System.out.print ("Enter number of throws:");
        int numThrows = sc.nextInt();
        double Difference = PI - Math.PI;
        System.out.println ("Number of throws = " + numThrows + ", Computed PI = " + PI + ", Difference = " + difference );       
    }when I tried to compile it says "cannot find variable 'distance' " in the while loop. but i thought i already declare that variable in the above method. Please give me some ideas to solve this problem and please check my program to see if there is any other mistakes.
    Thanks a lot.

    You've declared a local variable, distance, in the method isInside(). The scope of this variable is limited to the method in which it is declared. There is no declaration for distance in computePI() and that is why the compiler gives you an error.
    I won't check your entire program but I did notice that isInside() is declared to be a boolean method but doesn't return anything, let alone a boolean value. In fact, it doesn't even compute a boolean value.

  • URGENT!!! Need help with drawImage program.

    Hi...,
    This is my first time dealing with drawImage. This is my program:
    public void init ()
    img=getImage (getDocumentBase (), "knight.gif");
    do
    row=Integer.parseInt (JOptionPane.showInputDialog ("Enter starting row: "));
    while (row<1 || row>8);
    do
    col=Integer.parseInt (JOptionPane.showInputDialog ("Enter starting col: "));
    while (col<1 || col>8);
    moves=1;
    board=new int[9][9];
    public void paint (Graphics g)
    createBoard (g);
    if (checkPos (col+1, row+1))
    board[row][col]=moves;
    g.drawImage (img, col*50, row*50, this);
    g.drawString (Integer.toString(moves), ((col*50)+25), ((row*50)+25));
    moves++;
    makeMove ();
    I just include these 2 mehtods because there is something wrong when I execute this. In the paint method, I only do the drawImage once, but I don't know why it draws twice when I execute it. And when I put the "g.drawImage" line in comment, it's doing ok.
    I hope you guys understand me.
    Please help me. Thx

    Hi JeroenBoven,
    Thanks for your help. But, this is what I put in the createBoard method.
    private void createBoard (Graphics g)
              g.setColor (Color.black);
              for (int l=1; l<=9; l++)
                   g.drawLine (50*l, 50, 50*l, 450);
                   g.drawLine (50, 50*l, 450, 50*l);
    From what I think, the createBoard only drawLines and make a 8 * 8 board.

  • Need help with java program

    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. the GUI using Java graphics classes.
    ? Add a company logo to? Post as an attachment Course Syllabus
    here is my code // created by Nicholas Baatz on July 24,2007
      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
    //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
    final int dispProd = 0; // variable for actionEvents
    // 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)
    textArea.setText(nwProduct[0]+"\n");
    } // end firstBtn actionEvent
    }); // end firstBtn actionListener
    textArea.setText(nwProduct[4]+"n");
    // prevBtn.addActionListener(new ActionListener()
    // public void actionPerformed(ActionEvent ae)
    // dispProd = (nwProduct.length+dispProd-1) % nwProduct.length;
    // textArea.setText(nwProduct.display(dispProd)+"\n");
    // } // end prevBtn actionEvent
    // }); // end prevBtn 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 ProductAddI can not get all the buttons to work and do not know why can someone help me

    You have to have your code formatted correctly to begin with before you add the code tags. All your current code is left-justified and is not indented correctly.
    I only see that you've added an actionlistener to the "first" button.
    I recommend that you:
    1) again, do this first in a nonGUI class, then use this nonGUI class in your GUI class.
    2) Have a integer variable that holds the location of the current Product that your application is pointing to.
    3) Have a method called getProduct(int index) that returns the product that is at the location specified by the index in your array / arraylist / or whatever collection that you are using.
    4) Have your first button set index to 0 and then call getProduct(index).
    5) Have your last button set your index to the last product in your collection (i.e.: index = productCollection.length - 1 if this is an array), and then call getProduct(index).
    5) Have your next button increment your index up to the maximum allowed and then call getProduct(index). If it's an array it goes up to the array length - 1.
    6) If you want the next button to cause the index to roll over to the first, when you are at the last then then increment the index and mod it ("%" operator) by the length of the array...

  • Need help with Java Programming

    Hello All,
    I dont know how to save all the lines separatly and then work with the numbers?
    Example TxtIn:
    2 5
    0 9 2 3 4 // I dont know how many lines will appear, and dont know how many numbers in a line
    1 2 3 9
    1 5 4
    2 0 0 5 6
    2 5 1 9
    4 6 1 5
    4 9 1 8
    9 1 4 8
    9 5 0
    Example TxtOut:
    1 9 4 0
    I would really appreciate your help in this.
    In my code, i only past one time in the text file, and clear the numbers of the list, but i need to make more check =S
    Here is the code:
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.util.ArrayList;
    import java.util.Scanner;
    import java.util.StringTokenizer;
    * @author Antonio
    public class web {
        /** Creates a new instance of Main */
         * @param args the command line arguments
        public static void main(String[] args) throws FileNotFoundException {
            int contador;
            ArrayList<Integer> lista = new ArrayList<Integer>();
            Scanner scn = new Scanner(new File("in.txt"));
            try {
            PrintWriter fileOut = new PrintWriter(new FileWriter("out.txt"));
            int ciudades = scn.nextInt();
            int aerolineas = scn.nextInt();
            int ciudadabuscar = scn.nextInt();
            int aerolinea = scn.nextInt();
            int bandera=0;
            while (scn.hasNextLine()){
                    String cad = scn.nextLine();
                    StringTokenizer st = new StringTokenizer(cad," ");
             while (st.hasMoreTokens())
                    String t = st.nextToken();
                    lista.add ( Integer.parseInt(t) );
               int a[]= new int[lista.size()];
               for (int x=0; x<lista.size(); x++)
                            a[x] = lista.get(x);
                          for (int x=0; x<lista.size(); x++)
                   for (x=1;x<lista.size();x++){
                            if (ciudadabuscar == a[0] && aerolinea == a[1])//tenia x=1
                                for (x=2;x<lista.size();x++)
                                { fileOut.printf("%d ",a[x]);
                                  ciudadabuscar= a[2];
                                  bandera = 1;}
                         lista.clear();
            if(bandera==0){
            fileOut.println("No hay destinos posibles por esta línea");
            fileOut.close();
            }catch(FileNotFoundException ex){}catch(IOException ex){}
    }

    #1 Solution is the same as i am working but...if i found AND another pair needs tobe searched...i dont know how to start again with step 1...
    i onli continues reading..that is why i am never show
    2 5//i am reading the file looking for 2 and 5
    0 9 2 3 4
    1 2 3 9
    1 5 4 // I NEVER show the number 4....
    2 0 0 5 6
    2 5 1 9 // here i found them...and now i have to look in the file 1 5 and 9 5 (but 1 5 are before this..so i can never found them)
    4 6 1 5
    4 9 1 8
    9 1 4 8
    9 5 0 // here i found 9 5
    Correct OutTxt: 1 9 4 0
    My OutTxt: 1 9 0...Never show the number 4, because i dont know how to start again...
    thank u
    Edited by: Ing_Balderas on Dec 11, 2009 2:25 PM

  • I need help with my program.

    I want to make a program that display in a text box, text. Or yet, I'm not good with Java, I'm learning it.
    I have fiew problems with my code. First of all, when I start the "executable file", nothing happen.
    My other one is that I don't know how to "insert" text in a text box.
    I'd enjoy anykind of help. Here's very simple code that I use for now.
    package gamestarter;
    import java.util.Scanner;
    public class GameStarter {
        public static void main(String[] args) {
            System.out.print("Welcome on GameStarter.\n");
            System.out.print("Please enter your game name here:\n");
            Scanner getname = new Scanner(System.in);
            String gn = getname.nextLine();
            System.out.print("The game name you entered is: '"+gn+"'\n\n");
            System.out.print("Please enter the name of the bot you wish to wisper.\n");
            Scanner getwisp = new Scanner(System.in);
            String bot = getwisp.nextLine();
            System.out.print("The game should be succesfully announced to "+bot+"\n\n");
            String wisp = "/w "+bot+" !game 9 "+gn+"\n\n\n";
            System.out.print(wisp);
    }And last question, where can I edit the Interface of my program?

    Your program doesn't look like it has a GUI interface.
    It looks like a command line program. You might want
    to open the console or MS-DOS window and then run
    your program from the command line. Something like this:
    1) go to your program's home directory.
    2) type in -- java ./<yourClassFileName>
    Then see if anything happens. I can't tell what's in your
    gamestarter package.

  • Need help with Inventory program part 6

    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

    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

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