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    Connect 4 is a classic two-player game where players take turns dropping colored discs into a vertical grid. The objective is to connect four of one's own discs in a row, either horizontally, vertically, or diagonally.

    Example Implementation

    Here's a simple implementation of Connect 4 in Java:

    import java.util.Scanner;

    public class Connect4 {
    public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    char[][] grid = new char[6][7];

    // Initialize the grid
    for (int row = 0; row < grid.length; row++) {
    for (int col = 0; col < grid[0].length; col++) {
    grid[row][col] = ' ';
    }
    }

    int turn = 1;
    char player = 'R';
    boolean winner = false;

    // Play the game
    while (!winner && turn <= 42) {
    boolean validPlay;
    int play;
    do {
    display(grid);
    System.out.print("Player " + player + ", choose a column: ");
    play = in.nextInt();
    validPlay = validate(play, grid);
    } while (!validPlay);

    // Drop the checker
    for (int row = grid.length - 1; row >= 0; row--) {
    if (grid[row][play] == ' ') {
    grid[row][play] = player;
    break;
    }
    }

    // Check for a winner
    winner = isWinner(player, grid);

    // Switch players
    player = (player == 'R') ? 'B' : 'R';
    turn++;
    }

    display(grid);
    if (winner) {
    System.out.println("Player " + ((player == 'R') ? "B" : "R") + " won!");
    } else {
    System.out.println("Tie game");
    }
    }

    public static void display(char[][] grid) {
    System.out.println(" 0 1 2 3 4 5 6");
    System.out.println("---------------");
    for (int row = 0; row < grid.length; row++) {
    System.out.print("|");
    for (int col = 0; col < grid[0].length; col++) {
    System.out.print(grid[row][col]);
    System.out.print("|");
    }
    System.out.println();
    System.out.println("---------------");
    }
    }

    public static boolean validate(int column, char[][] grid) {
    if (column < 0 || column >= grid[0].length || grid[0][column] != ' ') {
    return false;
    }
    return true;
    }

    public static boolean isWinner(char player, char[][] grid) {
    // Check horizontal, vertical, and diagonal lines for a win
    for (int row = 0; row < grid.length; row++) {
    for (int col = 0; col < grid[0].length - 3; col++) {
    if (grid[row][col] == player && grid[row][col + 1] == player &&
    grid[row][col + 2] == player && grid[row][col + 3] == player) {
    return true;
    }
    }
    }
    for (int row = 0; row < grid.length - 3; row++) {
    for (int col = 0; col < grid[0].length; col++) {
    if (grid[row][col] == player && grid[row + 1][col] == player &&
    grid[row + 2][col] == player && grid[row + 3][col] == player) {
    return true;
    }
    }
    }
    for (int row = 3; row < grid.length; row++) {
    for (int col = 0; col < grid[0].length - 3; col++) {
    if (grid[row][col] == player && grid[row - 1][col + 1] == player &&
    grid[row - 2][col + 2] == player && grid[row - 3][col + 3] == player) {
    return true;
    }
    }
    }
    for (int row = 0; row < grid.length - 3; row++) {
    for (int col = 0; col < grid[0].length - 3; col++) {
    if (grid[row][col] == player && grid[row + 1][col + 1] == player &&
    grid[row + 2][col + 2] == player && grid[row + 3][col + 3] == player) {
    return true;
    }
    }
    }
    return false;
    }
    }
    Copied!
    What is Connect Four?
    A. Connect Four is a two-player game where players take turns dropping colored discs into a seven-column, six-row grid. Q. Can I enhance the game with AI?
    codingtechroom.com
    Baeldung
    https://www.baeldung.com/java-connect-4-game
    Implement Connect 4 Game with Java - Baeldung
  1. JavaProblems.com
    http://www.javaproblems.com › creating-connect-four-game-in-java.html

    Creating a Connect-Four Game in Java - java problems

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  4. Medium
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