[ICONIC]

I need a huge favor here, i am a teacher working on a program for my Programming class, the other classes made a program and i was wondering if anyone could help me out with it.


I need to Write a Java console program that will randomly generate the numbers for a Super 7 lottery ticket.

With each ticket the customer receives three sets of seven numbers. Each set of seven numbers is called a “board” in the lottery business. So, if the user buys just one ticket, they get 3 boards. If they buy two tickets, they get 6 boards. If they buy three tickets, they get 9 boards, and so on. Each number on a board is a unique integer (no duplicates permitted) in the range of 1 to 47 (inclusive).


The program should do the following:
• Ask the user how many tickets they want to purchase. Remember, for one ticket you have to generate three rows of seven numbers.
• Generate all the tickets, ensuring no duplicate numbers within each board, and sort them in ascending order (smallest to largest).
• Output the numbers as displayed in the screen shots below:


Figure 1 - Sample input and output

[Chicon]

Hi ICONIC,

I've built a class I called Ticket which constructor generates a bidimensional array - type : int[3][7].
The class provides two methods :
getBoards and getMatches

import java.util.Arrays;

public class Ticket {
    public static final int BOARDS = 3;
    public static final int DRAWS = 7;
    public static final int LIMIT = 47;
    
    private int[][] board;
    
    public Ticket() {
        init();
    }
    
    public int[][] getBoards() {
        return board;
    }
    
    public int[] getMatches(int[] draft) {
        int[] res = new int[BOARDS];
        int[] sorted = draft;
        Arrays.sort(sorted);
        for (int i = 0; i < sorted.length; i++) {
            for (int j = 0; j < BOARDS; j++) {
                for (int k = 0; k < DRAWS; k++) {
                    if (sorted[i]==board[j][k]) {
                        res[j]++;
                        break;
                    }    
                }
            }
        }
        return res;
    }
    
    private void init() {
        board = new int[BOARDS][DRAWS];
        int[] draft;
        for (int i = 0; i < BOARDS; i++) {
            draft = generateDraft();
            for (int j = 0; j < DRAWS; j++) {
                board[i][j] = draft[j];
            }
        }
    }
    
    private int[] generateDraft() {
        int[] draft = new int[DRAWS];
        boolean[] isUsed = new boolean[LIMIT];
        int index;
        for (int i = 0; i < DRAWS; i++) {
            index = (int) (Math.random() * LIMIT);
            while (isUsed[index]) {
                index++;
                if (index==LIMIT) index=0;
            }
            isUsed[index] = true;
            draft[i] = index + 1;
        }
        Arrays.sort(draft);
        return draft;
    }
}

Here's a small program to show how to use the Ticket class :

public class Test {
    
    public static void main(String[] args) {
        System.out.println("");
        Ticket ticket = new Ticket();
        int[][] boards = ticket.getBoards();
        for (int i = 0; i < Ticket.BOARDS; i++) {
            for (int j = 0; j < Ticket.DRAWS; j++) {
                System.out.print(boards[i][j] + " ");
            }
            System.out.println("");
        }
        
        int[] test = { 10, 15, 5, 6, 40, 25, 33 };
        int[] res = ticket.getMatches(test);
        System.out.println("");
        for (int j = 0; j < res.length; j++) {
            System.out.print(res[j] + " ");   
        }
        System.out.println("");
    }
    
}

I'll come back later with the console stuff.

[ICONIC]

thanks so much.

i took the top code and got this error:
Tickets2.java:10: class Ticket is public, should be declared in a file named Tic
ket.java
public class Ticket {

also i dont see any prompt or am i missing something?

[Chicon]

In my prior post, I told I was not ready with the console output.
BTW, I add a markBoards method in the Ticket to mark the winning numbers.

Here's the complete program (2 classes Ticket and Main stored in the package super7)

package super7;

import java.util.InputMismatchException;
import java.util.NoSuchElementException;
import java.util.Scanner;

public class Main {
    private static Scanner scan;
    private static int input;
    private static int[] win;
    
    public static void main(String[] args) {
        System.out.println("            Get your Super 7 lottery numbers !");
        
        System.out.println("");
        System.out.println("Enter the number of tickets you'd like to purchase (<=3) :");
        while(!getNumberTickets()) {}
        
        System.out.println("");
        System.out.println("Thanks for your purchase ! Here is the detail :");
        
        int[][] board = new int[Ticket.BOARDS][Ticket.DRAWS];
        Ticket[] ticket = new Ticket[input];
        for (int i=0; i < input; i++) {
            System.out.println("");
            System.out.println("Ticket " + (i+1));
            ticket[i] = new Ticket();
            board = ticket[i].getBoards();
            for (int j = 0; j < Ticket.BOARDS; j++) {
                System.out.print("  ");
                for (int k = 0; k < Ticket.DRAWS; k++) {
                    if (board[j][k] > 9) {
                        System.out.print("      " + board[j][k]);
                    } else {
                        System.out.print("       " + board[j][k]);
                    }
                }
                System.out.print("\n");
            }
        }
        
        System.out.println("");
        System.out.println("Enter 0 to quit, or 1 to check your ticket(s) :");
        while (!getChoice()) {}
        if (input==0) System.exit(input);
        
        System.out.println("");
        System.out.println("Enter the seven winning numbers in any order separated by spaces :");
        while (!getWinningNumbers()) {}
        
        System.out.println("");
        boolean[][] isWinning = new boolean[Ticket.BOARDS][Ticket.DRAWS];
        int[] matches = new int[Ticket.BOARDS];
        for (int i = 0; i < ticket.length; i ++) {
            board = ticket[i].getBoards();
            isWinning = ticket[i].markBoards(win);
            matches = ticket[i].getMatches(win);
            System.out.println("Checking ticket " + (i+1));
            for (int j = 0; j < Ticket.BOARDS; j++) {
                System.out.print("       Board " + (j+1) + " : ");
                for (int k = 0; k < Ticket.DRAWS; k++) {
                    if (isWinning[j][k]) {
                        if (board[j][k] > 9) {
                            System.out.print("  " + board[j][k]);
                        } else {
                            System.out.print("  " + board[j][k]);
                        }
                    }
                }
                if (matches[j] > 2) {
                    System.out.print("    (" + matches[j] + " MATCHES WIN !)");
                }
                System.out.print("\n");
            }
        }
    }
    
    private static boolean getNumberTickets() {
        scan = new Scanner(System.in);
        try {
            input = scan.nextInt();
            if ((input < 1) || (input > 3)) {
                System.out.println("The entered number is out of range !");
                System.out.println("Enter the number of tickets you'd like to purchase (<=3) :");
                return false;
            } else {
                return true;
            }
        } catch(InputMismatchException ime) {
            System.out.println("The entered value is not a number !");
            System.out.println("Enter the number of tickets you'd like to purchase (<=3) :");
            return false;
        }
    }
    
    private static boolean getChoice() {
        scan = new Scanner(System.in);
        try {
            input = scan.nextInt();
            if ((input < 0) || (input > 1)) {
                System.out.println("The entered number is out of range !");
                System.out.println("Enter 0 to quit, or 1 to check your ticket(s) :");
                return false;
            } else {
                return true;
            }
        } catch(InputMismatchException ime) {
            System.out.println("The entered value is not a number !");
            System.out.println("Enter 0 to quit, or 1 to check your ticket(s) :");
            return false;
        }
    }
    
    private static boolean getWinningNumbers() {
        win = new int[7];
        scan = new Scanner(System.in);
        String text = scan.nextLine();
        
        if (text.length()==0) {
            System.out.println("Nothing has been entered  !");
            System.out.println("Enter the seven winning numbers in any order separated by spaces :");
            return false;
        } else {
            scan = new Scanner(text);
            for (int i = 0; i < 7; i++) {
                try {
                    win[i] = scan.nextInt();
                    if ((win[i] < 1) || (win[i] > Ticket.LIMIT)) {
                        System.out.println("One of the entred numbers is out of range !");
                        System.out.println("Enter the seven winning numbers in any order separated by spaces :");
                        return false;
                    }
                } catch(InputMismatchException ime) {
                    System.out.println("There are illegal characters !");
                    System.out.println("Enter the seven winning numbers in any order separated by spaces :");
                    return false;
                } catch(NoSuchElementException nsee) {
                    System.out.println("The list of winning numbers is uncomplete !");
                    System.out.println("Enter the seven winning numbers in any order separated by spaces :");
                    return false;
                }
            }
        }
        return true;
    }
}

package super7;

import java.util.Arrays;

public class Ticket {
    public static final int BOARDS = 3;
    public static final int DRAWS = 7;
    public static final int LIMIT = 47;
    
    private int[][] board;
    
    public Ticket() {
        init();
    }
    
    public int[][] getBoards() {
        return board;
    }
    
    public int[] getMatches(int[] draft) {
        int[] res = new int[BOARDS];
        int[] sorted = draft;
        Arrays.sort(sorted);
        for (int i = 0; i < sorted.length; i++) {
            for (int j = 0; j < BOARDS; j++) {
                for (int k = 0; k < DRAWS; k++) {
                    if (sorted[i]==board[j][k]) {
                        res[j]++;
                        break;
                    }    
                }
            }
        }
        return res;
    }

    public boolean[][] markBoards(int[] draft) {
        boolean[][] res = new boolean[BOARDS][DRAWS];
        int[] sorted = draft;
        Arrays.sort(sorted);
        for (int i = 0; i < sorted.length; i++) {
            for (int j = 0; j < BOARDS; j++) {
                for (int k = 0; k < DRAWS; k++) {
                    if (sorted[i]==board[j][k]) {
                        res[j][k] = true;
                        break;
                    }    
                }
            }
        }
        return res;
    }    
    
    private void init() {
        board = new int[BOARDS][DRAWS];
        int[] draft;
        for (int i = 0; i < BOARDS; i++) {
            draft = generateDraft();
            for (int j = 0; j < DRAWS; j++) {
                board[i][j] = draft[j];
            }
        }
    }
    
    private int[] generateDraft() {
        int[] draft = new int[DRAWS];
        boolean[] isUsed = new boolean[LIMIT];
        int index;
        for (int i = 0; i < DRAWS; i++) {
            index = (int) (Math.random() * LIMIT);
            while (isUsed[index]) {
                index++;
                if (index==LIMIT) index=0;
            }
            isUsed[index] = true;
            draft[i] = index + 1;
        }
        Arrays.sort(draft);
        return draft;
    }
}

Also, I attached a zip file Super7.zip that contains the executable Super7.jar and a README file. Make sure you have the latest version of your Java runtime.
Good luck if you mean to use the program to play lottery !


Edit : Just corrected the program - a line was missing

[ICONIC]

Thanks, i really appreciate this