Create Bingo Game Using Java

Last Updated : 22 Sep, 2023

Bingo, a game of enduring appeal characterized by chance and anticipation, has consistently captivated players across generations. With its uncomplicated rules and element of unexpected delight, Bingo emerges as an ideal selection for diverse occasions. If your curiosity leads you into the realm of game development, embarking on the creation of a Bingo game using Java stands as a superb introductory step. Within this comprehensive guide, we shall navigate you through the journey, encompassing comprehension of game mechanics and culminating in the realization of a fully functional Bingo game.

Understanding the Bingo Game

Prior to diving into coding, it’s beneficial to gain a swift overview of the Bingo game’s mechanics. The game unfolds on a 5×5 grid, where each column symbolizes a distinct numerical range. Participants are equipped with Bingo cards, housing a varied collection of numbers drawn from these ranges. A designated caller randomly announces numbers, prompting players to cross off matching numbers on their cards. The ultimate aim is to achieve specific arrangements, such as lines, diagonals, or a full card, before others accomplish the same feat.

Project Initialization

Before embarking on the creation of your Java-based Bingo game, it’s crucial to establish your project environment. A development platform such as Eclipse or IntelliJ IDEA is essential for this endeavor. Here’s a step-by-step guide to configuring your project:

Initiate a Fresh Java Project: Launch your chosen Integrated Development Environment (IDE) and initiate a new Java project. Opt for a suitable name for your project, such as BingoGame.

Craft a Main Class: Within your project structure, generate a new Java class that will function as the game’s starting point. Consider naming this class BingoMain or GFG to reflect its role effectively.

Implementing Bingo’s Operational Logic

With a solid foundation in place, it’s time to bring the Bingo game’s core functionalities to life by translating the provided C++ code into Java. The Java version presented below encompasses crucial actions like number drawing, card marking, and the detection of winning patterns.

Java

import java.util.*; 
  
// Nikunj Sonigara 
class BingoCard { 
    // List to store the Bingo card numbers 
    List<Integer> numbers = new ArrayList<>(); 
} 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        Scanner scanner = new Scanner(System.in); 
        System.out.println("Welcome to Bingo!"); 
  
        // Random number generator 
        Random random = new Random(); 
  
        // Create Bingo cards for both players 
        BingoCard player1Card = createBingoCard(random); 
        BingoCard player2Card = createBingoCard(random); 
  
        // Tracks the current player 
        int currentPlayer = 1; 
  
        // Main game loop 
        while (true) { 
            // Get the current 
            // player's card 
            BingoCard currentCard = (currentPlayer == 1) 
                                        ? player1Card 
                                        : player2Card; 
  
            // Generate a random number between 0 and 25 
            int drawnNumber 
                = generateRandomNumber(random, 0, 25); 
            // Mark the drawn number on both player's cards 
            drawNumberAndMark(player1Card, player2Card, 
                              drawnNumber); 
  
            System.out.println("\nPlayer " + currentPlayer 
                               + " - Drawn Number: "
                               + drawnNumber); 
  
            // Display both player's cards 
            System.out.println("Player 1's Card:"); 
            displayCard(player1Card); 
            System.out.println( 
                "--------------------------"); 
            System.out.println("Player 2's Card:"); 
            displayCard(player2Card); 
            System.out.println( 
                "--------------------------"); 
  
            // Check if the current player has achieved 
            // Bingo 
            if (hasBingo(currentCard)) { 
                // Exit the game loop 
                System.out.println( 
                    "\nPlayer " + currentPlayer 
                    + " has achieved Bingo! Congratulations!"); 
                break; 
            } 
  
            // Switch to the other player for the next round 
            currentPlayer = (currentPlayer == 1) ? 2 : 1; 
        } 
        // Close the scanner 
        scanner.close(); 
    } 
  
    // Generates a random number between min and max 
    // (inclusive) 
    private static int
    generateRandomNumber(Random random, int min, int max) 
    { 
        return min + random.nextInt(max - min + 1); 
    } 
  
    // Creates a new Bingo card and shuffles the numbers 
    private static BingoCard createBingoCard(Random random) 
    { 
        BingoCard card = new BingoCard(); 
        List<Integer> possibleNumbers = new ArrayList<>(); 
        for (int i = 1; i <= 25; ++i) { 
            possibleNumbers.add(i); 
        } 
        Collections.shuffle(possibleNumbers, random); 
        // Add shuffled numbers to the 
        // card 
        card.numbers.addAll(possibleNumbers); 
        return card; 
    } 
  
    // Marks the drawn number on both player's cards 
    private static void
    drawNumberAndMark(BingoCard player1Card, 
                      BingoCard player2Card, int number) 
    { 
        for (int i = 0; i < player1Card.numbers.size(); 
             ++i) { 
            // Mark the number as drawn on 
            // player 1's card 
            if (player1Card.numbers.get(i) == number) { 
                player1Card.numbers.set(i, 0); 
            } 
  
            // Mark the number as drawn on 
            // player 2's card 
            if (player2Card.numbers.get(i) == number) { 
                player2Card.numbers.set(i, 0); 
            } 
        } 
    } 
  
    // Checks if the Bingo card has achieved a Bingo pattern 
    private static boolean hasBingo(BingoCard card) 
    { 
        for (int i = 0; i < 5; ++i) { 
            // Check rows for Bingo 
            if (card.numbers.get(i * 5) == 0
                && card.numbers.get(i * 5 + 1) == 0
                && card.numbers.get(i * 5 + 2) == 0
                && card.numbers.get(i * 5 + 3) == 0
                && card.numbers.get(i * 5 + 4) == 0) { 
                return true; 
            } 
  
            // Check columns for Bingo 
            if (card.numbers.get(i) == 0
                && card.numbers.get(i + 5) == 0
                && card.numbers.get(i + 10) == 0
                && card.numbers.get(i + 15) == 0
                && card.numbers.get(i + 20) == 0) { 
                return true; 
            } 
        } 
  
        // Check diagonals for Bingo 
        if ((card.numbers.get(0) == 0
             && card.numbers.get(6) == 0
             && card.numbers.get(12) == 0
             && card.numbers.get(18) == 0
             && card.numbers.get(24) == 0) 
            || (card.numbers.get(4) == 0
                && card.numbers.get(8) == 0
                && card.numbers.get(12) == 0
                && card.numbers.get(16) == 0
                && card.numbers.get(20) == 0)) { 
            return true; 
        } 
  
        // No Bingo pattern found 
        return false; 
    } 
  
    // Displays the Bingo card 
    private static void displayCard(BingoCard card) 
    { 
        for (int i = 0; i < card.numbers.size(); ++i) { 
            // Display numbers or 'X' for 
            // drawn numbers 
            System.out.print((card.numbers.get(i) != 0) 
                                 ? card.numbers.get(i) 
                                 : "X"); 
            System.out.print("\t"); 
  
            // Move to the next line 
            // after every 5 numbers 
            if ((i + 1) % 5 == 0) { 
                System.out.println(); 
            } 
        } 
    } 
}

Output:

Welcome to Bingo!
Player 1 - Drawn Number: 20
Player 1's Card:
7       23      21      4       5
22      3       15      2       10
19      6       18      9       17
11      16      8       25      X
12      13      14      24      1
--------------------------
Player 2's Card:
3       24      X       15      14
5       6       7       11      10
16      2       8       19      4
1       25      22      23      9
18      17      12      13      21
--------------------------
Player 2 - Drawn Number: 20
Player 1's Card:
7       23      21      4       5
22      3       15      2       10
19      6       18      9       17
11      16      8       25      X
12      13      14      24      1
--------------------------
Player 2's Card:
3       24      X       15      14
5       6       7       11      10
16      2       8       19      4
1       25      22      23      9
18      17      12      13      21
--------------------------
Player 1 - Drawn Number: 22
Player 1's Card:
7       23      21      4       5
X       3       15      2       10
19      6       18      9       17
11      16      8       25      X
12      13      14      24      1
--------------------------
Player 2's Card:
3       24      X       15      14
5       6       7       11      10
16      2       8       19      4
1       25      X       23      9
18      17      12      13      21
--------------------------
Player 2 - Drawn Number: 21
Player 1's Card:
7       23      X       4       5
X       3       15      2       10
19      6       18      9       17
11      16      8       25      X
12      13      14      24      1
--------------------------
Player 2's Card:
3       24      X       15      14
5       6       7       11      10
16      2       8       19      4
1       25      X       23      9
18      17      12      13      X
--------------------------
Player 1 - Drawn Number: 24
Player 1's Card:
7       23      X       4       5
X       3       15      2       10
19      6       18      9       17
11      16      8       25      X
12      13      14      X       1
--------------------------
Player 2's Card:
3       X       X       15      14
5       6       7       11      10
16      2       8       19      4
1       25      X       23      9
18      17      12      13      X
--------------------------
Player 2 - Drawn Number: 3
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       18      9       17
11      16      8       25      X
12      13      14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       11      10
16      2       8       19      4
1       25      X       23      9
18      17      12      13      X
--------------------------
Player 1 - Drawn Number: 21
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       18      9       17
11      16      8       25      X
12      13      14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       11      10
16      2       8       19      4
1       25      X       23      9
18      17      12      13      X
--------------------------
Player 2 - Drawn Number: 11
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       18      9       17
X       16      8       25      X
12      13      14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      4
1       25      X       23      9
18      17      12      13      X
--------------------------
Player 1 - Drawn Number: 3
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       18      9       17
X       16      8       25      X
12      13      14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      4
1       25      X       23      9
18      17      12      13      X
--------------------------
Player 2 - Drawn Number: 17
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       18      9       X
X       16      8       25      X
12      13      14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      4
1       25      X       23      9
18      X       12      13      X
--------------------------
Player 1 - Drawn Number: 18
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       X       9       X
X       16      8       25      X
12      13      14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      4
1       25      X       23      9
X       X       12      13      X
--------------------------
Player 2 - Drawn Number: 13
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       X       9       X
X       16      8       25      X
12      X       14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      4
1       25      X       23      9
X       X       12      X       X
--------------------------
Player 1 - Drawn Number: 21
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       X       9       X
X       16      8       25      X
12      X       14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      4
1       25      X       23      9
X       X       12      X       X
--------------------------
Player 2 - Drawn Number: 13
Player 1's Card:
7       23      X       4       5
X       X       15      2       10
19      6       X       9       X
X       16      8       25      X
12      X       14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      4
1       25      X       23      9
X       X       12      X       X
--------------------------
Player 1 - Drawn Number: 4
Player 1's Card:
7       23      X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       25      X
12      X       14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
1       25      X       23      9
X       X       12      X       X
--------------------------
Player 2 - Drawn Number: 18
Player 1's Card:
7       23      X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       25      X
12      X       14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
1       25      X       23      9
X       X       12      X       X
--------------------------
Player 1 - Drawn Number: 25
Player 1's Card:
7       23      X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       X       X
12      X       14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
1       X       X       23      9
X       X       12      X       X
--------------------------
Player 2 - Drawn Number: 18
Player 1's Card:
7       23      X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       X       X
12      X       14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
1       X       X       23      9
X       X       12      X       X
--------------------------
Player 1 - Drawn Number: 23
Player 1's Card:
7       X       X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       X       X
12      X       14      X       1
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
1       X       X       X       9
X       X       12      X       X
--------------------------
Player 2 - Drawn Number: 1
Player 1's Card:
7       X       X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       X       X
12      X       14      X       X
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
X       X       X       X       9
X       X       12      X       X
--------------------------
Player 1 - Drawn Number: 17
Player 1's Card:
7       X       X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       X       X
12      X       14      X       X
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
X       X       X       X       9
X       X       12      X       X
--------------------------
Player 2 - Drawn Number: 24
Player 1's Card:
7       X       X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       X       X
12      X       14      X       X
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
X       X       X       X       9
X       X       12      X       X
--------------------------
Player 1 - Drawn Number: 12
Player 1's Card:
7       X       X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       X       X
X       X       14      X       X
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
X       X       X       X       9
X       X       X       X       X
--------------------------
Player 2 - Drawn Number: 11
Player 1's Card:
7       X       X       X       5
X       X       15      2       10
19      6       X       9       X
X       16      8       X       X
X       X       14      X       X
--------------------------
Player 2's Card:
X       X       X       15      14
5       6       7       X       10
16      2       8       19      X
X       X       X       X       9
X       X       X       X       X
--------------------------
Player 2 has achieved Bingo! Congratulations!