Help Needed on a java program

I am very new to java and our teacher has given us a program
that i am having quite a bit of trouble with. I was wondering if anyone could help me out.
This is the program which i have bolded.
{You will write a Java class to play the TicTacToe game. This program will have at least two data members, one for the status of the board and one to keep track of whose turn it is. All data members must be private. You will create a user interface that allows client code to play the game.
The user interface must include:
� Boolean xPlay(int num) which allows x to play in the square labeled by num. This function will return true if that play caused the game to end and false otherwise.
� Boolean oPlay(int num) which allows o to play in the square labeled by num. This function will return true if that play caused the game to end and false otherwise.
� Boolean isEmpty(int num) will check to see if the square labeled by num is empty.
� Void display() which displays the current game status to the screen.
� Char whoWon() which will return X, O, or C depending on the outcome of the game.
� You must not allow the same player to play twice in a row. Should the client code attempt to, xPlay or oPlay should print an error and do nothing else.
� Also calling whoWon when the game is not over should produce an error message and return a character other than X, O, or C.
� Client code for the moment is up to you. Assume you have two human players that can enter the number of the square in which they want to play.
Verifying user input WILL be done by the client code.}

This is the program which i have bolded.Hmmm, that doesn't look like any programming language I've ever seen. I guess you have the wrong forum here, because it isn't Java.
That looks like a natural-language programming language that directly understands a homework assignment. Either that, or you really did just post the assignment. You wouldn't have done that though, right?

Similar Messages

  • Help needed, new to java programming

    hi,
    I have craeted a Frame with some check boxes and button called "button1".
    Can anyone tell me how can i count the number of CHECKED check boxes so that when i press the button1 in my code it should display the result as number of checked check boxes divided by total number of check boxes. It should display the result in a textfield here RESULT textfield in my code
    Thanks in advance ...i am sending the code i have written so far....
    public class Frame extends java.awt.Frame {
        /** Creates new form Frame */
        public Frame() {
            initComponents();
            setSize(600, 600);
        /** This method is called from within the constructor to
         * initialize the form.
         * WARNING: Do NOT modify this code. The content of this method is
         * always regenerated by the Form Editor.
        private void initComponents() {
            buttonGroup1 = new javax.swing.ButtonGroup();
            checkbox1 = new java.awt.Checkbox();
            checkbox2 = new java.awt.Checkbox();
            checkbox3 = new java.awt.Checkbox();
            button1 = new java.awt.Button();
            textField1 = new java.awt.TextField();
            setLayout(null);
            addWindowListener(new java.awt.event.WindowAdapter() {
                public void windowClosing(java.awt.event.WindowEvent evt) {
                    exitForm(evt);
            checkbox1.setLabel("checkbox1");
            add(checkbox1);
            checkbox1.setBounds(160, 50, 84, 20);
            checkbox2.setLabel("checkbox2");
            add(checkbox2);
            checkbox2.setBounds(160, 70, 84, 20);
            checkbox3.setLabel("checkbox3");
            add(checkbox3);
            checkbox3.setBounds(160, 90, 84, 20);
            button1.setLabel("button1");
            button1.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    button1ActionPerformed(evt);
            add(button1);
            button1.setBounds(150, 180, 57, 24);
            textField1.setText("Result");
            textField1.setName("Result");
            add(textField1);
            textField1.setBounds(260, 180, 44, 20);
            pack();
        private void button1ActionPerformed(java.awt.event.ActionEvent evt) {
            // Add your handling code here:
        /** Exit the Application */
        private void exitForm(java.awt.event.WindowEvent evt) {
            System.exit(0);
         * @param args the command line arguments
        public static void main(String args[]) {
            new Frame().show();
        // Variables declaration - do not modify
        private java.awt.Button button1;
        private javax.swing.ButtonGroup buttonGroup1;
        private java.awt.Checkbox checkbox1;
        private java.awt.Checkbox checkbox2;
        private java.awt.Checkbox checkbox3;
        private java.awt.TextField textField1;
        // End of variables declaration
    }

    Two problems in the code you repost-ed:
    1. It lacks import statements.
    2. There is an extraneous } at the end of the button1ActionPerformed method.
    Correct them and it'll work fine. Posting the full source code:
    import java.awt.Component;
    import java.awt.Checkbox;
    public class Frame extends java.awt.Frame
         /** Creates new form Frame */
         public Frame()
              initComponents();
          * This method is called from within the constructor to initialize the form.
          * WARNING: Do NOT modify this code. The content of this method is always
          * regenerated by the Form Editor.
         private void initComponents()
              checkbox1 = new java.awt.Checkbox();
              checkbox2 = new java.awt.Checkbox();
              checkbox3 = new java.awt.Checkbox();
              button1 = new java.awt.Button();
              textField1 = new java.awt.TextField();
              setLayout( null );
              addWindowListener( new java.awt.event.WindowAdapter()
                   public void windowClosing( java.awt.event.WindowEvent evt )
                        exitForm( evt );
              checkbox1.setLabel( "checkbox1" );
              add( checkbox1 );
              checkbox1.setBounds( 120, 40, 84, 20 );
              checkbox2.setLabel( "checkbox2" );
              add( checkbox2 );
              checkbox2.setBounds( 120, 60, 84, 20 );
              checkbox3.setLabel( "checkbox3" );
              add( checkbox3 );
              checkbox3.setBounds( 120, 80, 84, 20 );
              button1.setLabel( "button1" );
              button1.addActionListener( new java.awt.event.ActionListener()
                   public void actionPerformed( java.awt.event.ActionEvent evt )
                        button1ActionPerformed( evt );
              add( button1 );
              button1.setBounds( 50, 170, 57, 24 );
              textField1.setText( "textField1" );
              add( textField1 );
              textField1.setBounds( 240, 170, 60, 20 );
              pack();
         private void button1ActionPerformed( java.awt.event.ActionEvent evt )
              // Add your handling code here:
              Component[] components = getComponents();
              int numOfCheckBoxes = 0;
              int numChecked = 0;
              for ( int i = 0; i < components.length; i++ )
                   if ( components[i] instanceof Checkbox )
                        numOfCheckBoxes++;
                        Checkbox checkBox = (Checkbox) components;
                        if ( checkBox.getState() )
                             numChecked++;
              double ratio = (double) numChecked / (double) numOfCheckBoxes;
              textField1.setText( Double.toString( ratio ) );
         /** Exit the Application */
         private void exitForm( java.awt.event.WindowEvent evt )
              System.exit( 0 );
         * @param args the command line arguments
         public static void main( String args[] )
              new Frame().show();
         // Variables declaration - do not modify
         private java.awt.Button button1;
         private java.awt.Checkbox checkbox1;
         private java.awt.Checkbox checkbox2;
         private java.awt.Checkbox checkbox3;
         private java.awt.TextField textField1;
         // End of variables declaration
    I can see from the code that the GUI was generated by a tool. Since you're new to Java programming, I'd recommend ditching the tool and writing everything by hand, otherwise you're not learning much. It's just like when you're learning proofs in Maths, where you start with first principles before making use of the proofs on their own.
    Also, it'll help tremendously if you could spend some time going through the Java Tutorial (http://java.sun.com/docs/books/tutorial/). It's free, and I find it very useful.
    Hth.

  • Need help in my assignment, Java programing?

    Need help in my assignment, Java programing?
    It is said that there is only one natural number n such that n-1 is a square and
    n + 1 is a cube, that is, n - 1 = x2 and n + 1 = y3 for some natural numbers x and y. Please implement a program in Java.
    plz help!!
    and this is my code
    but I don't no how to finsh it with the right condition!
    plz heelp!!
    and I don't know if it right or wrong!
    PLZ help me!!
    import javax.swing.JOptionPane;
    public class eiman {
    public static void main( String [] args){
    String a,b;
    double n,x,y,z;
    boolean q= true;
    boolean w= false;
    a=JOptionPane.showInputDialog("Please enter a number for n");
    n=Double.parseDouble(a);
    System.out.println(n);
    x=Math.sqrt(n-1);
    y=Math.cbrt(n+1);
    }

    OK I'll bite.
    I assume that this is some kind of assignment.
    What is the program supposed to do?
    1. Figure out the value of N
    2. Given an N determine if it is the correct value
    I would expect #1, but then again this seem to be a strange programming assignment to me.
    // additions followI see by the simulpostings that it is indeed #1.
    So I will give the tried and true advice at the risk of copyright infringement.
    get out a paper and pencil and think about how you would figure this out by hand.
    The structure of a program will emerge from the mists.
    Now that I think about it that advice must be in public domain by now.
    Edited by: johndjr on Oct 14, 2008 3:31 PM
    added additional info

  • Need help in creating a java program

    Hi everyone.
    I'd like to say before i start about my problem, that i've only begun learning java and my teacher hasn't explained anything at all. He only showed us by doing it himself and then showing us the final version. I've searched a little on how to program but i get little success in finding a good tutorial.
    I need help creating a program which has been assigned to me due in a few days in which i can't contact my teacher for help.
    I need to write a java program which inputs 3 items. The number of kilometres you drove, the number of litres of gas you used and the price you paid for the gas. Then, the program must calculate the number of litres used per 100km driven, which is litres divided by kilometres times 100, how much it costs to drive 100km, which is the result (a) times the price per litre and the number of miles per American gallon of gas ( one American gallon = 3.785 litres, and one mile = 1.609 km.
    The program has to output my name, the inputs given, the results computed and a message saying "Program Complete".
    To give you what i've done to begin with, from what i understood, is:
    import javax.swing.JOptionPane;
    public class prog1
         public static void main(String args[])
              final double americanGallon = 3.785;
              final double mile = 1.609;
              kilometresDriven,
              gasUsed;
              priceOfLiterGas;
              System.out.println("My Name");
              System.out.println("Number of kilometres driven:");
              kilometresDriven = JOptionPane.showInputDialog ("Kilometres Driven");
              System.out.println("Number of Litres of gas used:");
              gasUsed = JOptionPane.showInputDialog ("Litres of gas used");
              System.out.println("Price of a liter of gas:");
              priceOfLiterGas = JoptionPane.showInputDialog("Price per liter");
    Up to now, that's all i've got. i know i'm wrong, but i'm not sure how to do this. Could someone give me an outline of what this program is suppose to look like?
    Thanks in advance.

    Here's an update on my program. I've worked on certain details and would need your comments whether it contains errors. I'd also want to know if it would work or not because i don't know how to check it on my computer.
    Here's the update:
    import javax.swing.JOptionPane;
    public class Prog1
    public static void main(String args[])
    String name;
    double kmDriven;
    double litresUsed;
    double pricePaidForGas;
    double priceOfALiter;
    name = JOptionPane.showInputDialog("Name");
    input = JOptionPane.showInputDialog("Number of km driven");
    kmDriven = Double.parseDouble (input);
    input = JOptionPane.showInputDialog("Number of litres of gas used");
    litresUsed = Double.parseDouble (input);
    input = JOptionPane.showInputDialog("Price paid for gas");
    pricePaidForGas = Double.parseDouble (input);
    input = JOptionPane.showInputDialog("Price of a litre of gas");
    priceOfALiter = Double.parseDouble (input);
    a = (litresUsed/kmDriven)*100;
    b = ((litresUsed/kmDriven)*100)*priceOfALiter);
    c = (kmDriven/1.609)
    System.out.println("Name:" + name);
    System.out.println("Number of litres used per 100km:" + a);
    System.out.println("Cost of driving 100km" + b);
    System.out.println("Number of miles per American Gallon of Gas:" + c);
    System.out.println("Program Complete");
    System.exit(0);
    Comments please.
    Thanks in advance

  • Need help with running a Java program on Linux

    I am trying to get a Java program to run on a Linux machine. The program is actually meant for a Mac computer. I want to see if someone with Java experience can help me determine what is causing the program to stall. I was successful in getting it installed on my Linux machine and to partially run.
    The program is an interface to a database. I get the login screen to appear, but then once I enter my information and hit enter the rest of the program never shows, however, it does appear to connect in the background.
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    at java.awt.Container.addImpl(Unknown Source)
    at java.awt.Container.add(Unknown Source)
    I am not a programmer and I am hoping this will make some sense to someone. Any help in resolving this is greatly appreciated!

    Well, without knowing a little bit about programming, and how to run your debugger, I don't think you're going to fix it. The IllegalArgumentException is saying that some call does not like what it's getting. So you'll have to go in an refactor at least that part of the code.

  • Desperately need some help with client-server java programming

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    arun,
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  • Challange for you, help for me! java program

    I am a beginning java student and desparately (again) in help of someone who will check my java program. See below what they want from me, and try to make a program of it that works in all the ways that are asked. Thank you for helping me, i am running out of time.
    Prem Pradeep
    [email protected]
    Catalogue Manager II
    Specification:
    1.     Develop an object to represent to encapsulate an item in a catalogue. Each CatalogueItem has three pieces of information: an alphanumeric catalogue code, a name, and a price (in dollars and cents), that excludes sales tax. The object should also be able to report the price, inclusive of a 15% sales tax, and the taxed component of the price.
    2.     Data input will come from a text file, whose name is passed in as the first command-line argument to the program. This data file may include up to 30 data items (the program will need to be able to support a variable number of actual items in the array without any errors).
    3.     The data lines will be in the format: CatNo:Description:Price Use a StringTokenizer object to separate these data lines into their components.
    4.     A menu should appear, prompting the user for an action:
    a.     Display all goods: this will display a summary (in tabulated form) of all goods currently stored in the catalogue: per item the category, description, price excluding tax, payable tax and price including tax.
    b.     Dispfay cheapest/dearest goods: this will display a summary of all the cheapest and most expensive item(s) in the catalogue. In the case of more than one item being the cheapest (or most expensive), they should all be listed.
    c.     Sort the list: this will use a selection sort algorithm to sort the list in ascending order, using the catalogue number as the key.
    d.     Search the list: this will prompt the user for a catalogue number, and use a binary search to find the data. If the data has not yet been sorted, this menu option should not operate, and instead display a message to the user to sort the data before attempting a search
    5.     Work out a way to be able to support the inc tax/ex tax price accessors, and the tax component accessor, without needing to store any additional information in the object.
    6.     Use modifiers where appropriate to:
    a.     Ensure that data is properly protected;
    b.     Ensure that the accessors and mutators are most visible;
    c.     The accessors and mutators for the catalogue number and description cannot be overridden.
    d.     The constant for the tax rate is publicly accessible, and does not need an instance of the class present in order to be accessible.
    7.     The program should handle all exceptions wherever they may occur (i.e. file 1/0 problems, number formatting issues, etc.) A correct and comprehensive exception handling strategy (leading to a completely robust program) will be necessary and not an incomplete strategy (i.e. handling incorrect data formats, but not critical errors),
    Sample Execution
    C:\> java AssignmentSix mydata.txt
    Loading file data from mydata.txt ...17 item(s) OK
    CATALOGUE MANAGER: MAIN MENU
    ============================
    a) display all goods b) display cheapest/dearest goods
    c) sort the goods list d) search the goods list
    e) quit
    Option: d
    The goods cannot be searched, as the list is not yet sorted.
    CATALOGUE MANAGER: MAIN MENU
    ============================
    a) display all goods b) display cheapest/dearest goods
    c) sort the goods list d) search the goods list
    e) quit
    Option: b
    CHEAPEST GOODS IN CATALOGUE
    Cat      Description      ExTax      Tax      IncTax
    BA023      Headphones      23.00      3.45      26.45
    JW289      Tape Recorder     23.00      3.45      26.45
    MOST EXPENSIVE GOODS IN CATALOGUE
    Cat      Description      ExTax      Tax      IncTax
    ZZ338      Wristwatch      295.00 44.25      339.25
    CATALOGUE MANAGER: MAIN MENU
    ============================
    a) display all goods b) display cheapest/dearest goods
    c) sort the goods list d) search the goods list
    e) quit
    Option: c
    The data is now sorted.
    CATALOGUE MANAGER: MAIN MENU
    ============================
    a) display all goods b) display cheapest/dearest goods
    c) sort the goods list d) search the goods list
    e) quit
    Option: d
    Enter the catalogue number to find: ZJ282
    Cat Description ExTax Tax IncTax
    ZJ282 Pine Table 98.00 14.70 112.70
    CATALOGUE MANAGER: MAIN MENU
    ============================
    a) display all goods b) display cheapest/dearest goods
    c) sort the goods list d) search the goods list
    e) quit
    Option: e
    Here you have the program as far as I could get. Please try to help me make it compact and implement a sorting method.
    Prem.
    By the way: you can get 8 Duke dollars (I have this topic also in the beginnersforum)
    //CatalogueManager.java
    import java.io.*;
    import java.text.DecimalFormat;
    import java.util.StringTokenizer;
    public class CatalogueManager {
    // private static final double TAXABLE_PERCENTAGE = 0.15;
    // Require it to be publicly accessible
    // static means it is class variable, not an object instance variable.
    public static final double TAXABLE_PERCENTAGE = 0.15;
    private String catalogNumber;
    private String description;
    private double price;
    /** Creates a new instance of CatalogueManager */
    public CatalogueManager() {
    catalogNumber = null;
    description = null;
    price = 0;
    public CatalogueManager(String pCatalogNumber, String pDescription, double pPrice) {
    catalogNumber = pCatalogNumber;
    description = pDescription;
    price = pPrice;
    // the mutators must be most visible
    // the final keyword prevents overridden
    public final void setCatalogNumnber(String pCatalogNumber) {
    catalogNumber = pCatalogNumber;
    // the mutators must be most visible
    // the final keyword prevents overridden
    public final String getCatalogNumber() {
    String str = catalogNumber;
    return str;
    // the mutators must be most visible
    // the final keyword prevents overridden
    public final void setDescription(String pDescription) {
    description = pDescription;
    // the accessors must be most visible
    // the final keyword prevents overridden
    public final String getDescription() {
    String str = description;
    return str;
    // If the parameter is not a double type, set the price = 0;
    // the mutators must be most visible
    public boolean setPrice(String pPrice) {
    try {
    price = Double.parseDouble(pPrice);
    return true;
    catch (NumberFormatException nfe) {
    price = 0;
    return false;
    // the accessors must be most visible
    public double getPrice() {
    double rprice = price;
    return formatDouble(rprice);
    double getTaxAmount(){
    double rTaxAmount = price * TAXABLE_PERCENTAGE;
    return formatDouble(rTaxAmount);
    double getIncTaxAmount() {
    double rTaxAmount = price * (1 + TAXABLE_PERCENTAGE);
    return formatDouble(rTaxAmount);
    double formatDouble(double value) {
    DecimalFormat myFormatter = new DecimalFormat("###.##");
    String str1 = myFormatter.format(value);
    return Double.parseDouble(str1);
    public static void main(String[] args) throws IOException {
    final int MAX_INPUT_ALLOW = 30;
    int MAX_CURRENT_INPUT = 0;
    FileReader fr;
    BufferedReader br;
    CatalogueManager[] catalogList = new CatalogueManager[MAX_INPUT_ALLOW];
    String str;
    char chr;
    boolean bolSort = false;
    double cheapest = 0;
    double mostExpensive = 0;
    String header = "Cat\tDescription\tExTax\tTax\tInc Tax";
    String lines = "---\t-----------\t------\t---\t-------";
    if (args.length != 1) {
    System.out.println("The application expects one parameter only.");
    System.exit(0);
    try {
    fr = new FileReader(args[0]);
    br = new BufferedReader(fr);
    int i = 0;
    while ((str = br.readLine()) != null) {
    catalogList[i] = new CatalogueManager();
    StringTokenizer tokenizer = new StringTokenizer(str, ":" );
    catalogList.setCatalogNumnber(tokenizer.nextToken().trim());
    catalogList[i].setDescription(tokenizer.nextToken().trim());
    if (! catalogList[i].setPrice(tokenizer.nextToken())){
    System.out.println("The price column cannot be formatted as dobule type");
    System.out.println("Application will convert the price to 0.00 and continue with the rest of the line");
    System.out.println("Please check line " + i);
    if (catalogList[i].getPrice() < cheapest) {
    cheapest = catalogList[i].getPrice();
    if (catalogList[i].getPrice() > mostExpensive) {
    mostExpensive = catalogList[i].getPrice();
    i++;
    fr.close();
    MAX_CURRENT_INPUT = i;
    catch (FileNotFoundException fnfe) {
    System.out.println("Input file cannot be located, please make sure the file exists!");
    System.exit(0);
    catch (IOException ioe) {
    System.out.println(ioe.getMessage());
    System.out.println("Application cannot read the data from the file!");
    System.exit(0);
    boolean bolLoop = true;
    BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
    do {
    System.out.println("");
    System.out.println("CATALOGUE MANAGER: MAIN MENU");
    System.out.println("============================");
    System.out.println("a) display all goods b) display cheapest/dearest goods");
    System.out.println("c) sort the goods list d) search the good list");
    System.out.println("e) quit");
    System.out.print("Option:");
    try {
    str = stdin.readLine();
    if (str.length() == 1){
    str.toLowerCase();
    chr = str.charAt(0);
    switch (chr){
    case 'a':
    System.out.println(header);
    System.out.println(lines);
    for (int i = 0; i < MAX_CURRENT_INPUT; i++){
    System.out.println(catalogList[i].getCatalogNumber() + "\t" +
    catalogList[i].getDescription() + "\t" +
    catalogList[i].getPrice() + "\t" +
    catalogList[i].getTaxAmount() + "\t" +
    catalogList[i].getIncTaxAmount());
    System.out.println("");
    break;
    case 'b':
    System.out.println("");
    System.out.println("CHEAPEST GOODS IN CATALOGUE");
    System.out.println(header);
    System.out.println(lines);
    for (int i = 0; i < MAX_CURRENT_INPUT; i++){
    if (catalogList[i].getPrice() == cheapest){
    System.out.println(catalogList[i].getCatalogNumber() + "\t" +
    catalogList[i].getDescription() + "\t" +
    catalogList[i].getPrice() + "\t" +
    catalogList[i].getTaxAmount() + "\t" +
    catalogList[i].getIncTaxAmount());
    System.out.println("");
    System.out.println("MOST EXPENSIVE GODS IN CATALOGUE");
    System.out.println(header);
    System.out.println(lines);
    for (int i = 0; i < MAX_CURRENT_INPUT; i++){
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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