Minesweeper in Java

Minesweeper is a video game where you are trying to clear a "board" while avoiding the hidden traps. There are individual squares which serve as these traps; all of the other squares are defined by the number of traps adjacent to that square. This means that a non-trap square can have a maximum value of eight (although this is highly unlikely). (Source). Here is an example of minesweeper wit a 2D GUI (Graphical User Interface): http://minesweeperonline.com/

This implementation utilizes 2D arrays but does not include a graphical user interface. For this java code, the "9" represents a trap or bomb while -1 represents a spot on the board which isn't visible. Therefore the original board looks like this:


This version also does not include any method to "flow" and reveal all zeroes adjacent to one another. Therefore, you need to reveal each square one at a time.

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public class MinesweeperGame {
    private int rows;
    private int columns;
    private int mines;
    private int board[][];
    private int visibleBoard[][];

    public MinesweeperGame(int inputRows, int inputColumns, int inputMines) { // Service Constructor
        rows = inputRows;
        columns = inputColumns;
        mines = inputMines;
        visibleBoard = new int[rows][columns];
        board = this.createBoard();
        board = populateBoard(board);
        visibleBoard();
    }

    public int playerInteract(int inputRow, int inputColumn) { // Determines the result of an interaction with the board and changes all components appropriately
        if (board[inputRow][inputColumn] == 9) {
            return 2;
        }
        else {
            visibleBoard[inputRow][inputColumn] = board[inputRow][inputColumn];
        }
        for (int i = 0; i< rows; i++) { // Checks for a win, if they haven't won yet, then they need to keep playing
            for (int j = 0; j < columns; j++) {
                if (board[i][j] != 9) {
                    if (visibleBoard[i][j] == board[i][j]) {
                        visibleBoard[i][j] = visibleBoard[i][j];
                    }
                    else {
                        return 0;
                    }
                }
            }
        }
        return 1;
    }

    public void getVisibleBoard() {
        printBoard(visibleBoard);
    } // Calls the "visible" board, i.e. what the player can see
    public void getBoard() {
        printBoard(board);
    } // Calls the master board with all of the answers

    private int[][] createBoard(){ // Helper Method to instantiate the board
        int temp[][] = new int[rows][columns];
        return temp;
    }

    private int[][] populateBoard(int inputBoard[][]) { // Helper Method to randomly place mines
        while (mines != 0) {
            int a = (int)(Math.random()*rows);
            int b = (int)(Math.random()*columns);
            if (inputBoard[a][b] == 0) {
                inputBoard[a][b] = 9;
                mines -= 1;
            }
        }

        for(int i = 0; i < rows; i++) { // This section then assigns each space of number based on the surrounding mines.
            for (int j = 0; j < columns; j++) {
                if (inputBoard[i][j] != 9) {
                    int tempMines = 0;
                    if ((j - 1) != -1) {
                        if (inputBoard[i][j - 1] == 9) {
                            tempMines += 1;
                        }
                    }
                    if ((i - 1) != -1) {
                        if (inputBoard[i - 1][j] == 9) {
                            tempMines += 1;
                        }
                    }
                    if ((i - 1) != -1 && (j - 1) != -1) {
                        if (inputBoard[i - 1][j - 1] == 9) {
                            tempMines += 1;
                        }
                    }
                    if ((i - 1) != -1 && (j + 1) != columns) {
                        if (inputBoard[i - 1][j + 1] == 9) {
                            tempMines += 1;
                        }
                    }
                    if ((i + 1) != rows) {
                        if (inputBoard[i + 1][j] == 9) {
                            tempMines += 1;
                        }
                    }
                    if ((j + 1) != columns) {
                        if (inputBoard[i][j + 1] == 9) {
                            tempMines += 1;
                        }
                    }
                    if ((i + 1) != rows && (j + 1) != columns) {
                        if (inputBoard[i + 1][j + 1] == 9) {
                            tempMines += 1;
                        }
                    }
                    if ((i + 1) != rows && (j - 1) != -1) {
                        if (inputBoard[i + 1][j - 1] == 9) {
                            tempMines += 1;
                        }
                    }
                    inputBoard[i][j] = tempMines;
                }
            }
        }
        return (inputBoard);
    }

    private void printBoard(int inputBoard[][]) { // Prints the board in a neat matrix fashion
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < columns; j++) {
                System.out.print(inputBoard[i][j] + "   ");
            }
            System.out.println();
        }
    }

    private void visibleBoard() { // Generates a blank "visible board"
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < columns; j++) {
                visibleBoard[i][j] = -1;
            }
        }
        printBoard(visibleBoard);
    }

}

Here is the driver class for the above game. This version is very customizable; the user selects the # of traps and the dimensions of the board. Furthermore, this edition does not have an option to replay the game; it automatically shuts down after a win or loss.

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import java.util.Scanner;

public class MinesweeperPlayer {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Please enter three positive constants (the # of rows | the # of columns | the # of mines): ");
        int rows = sc.nextInt();
        int columns = sc.nextInt();
        int mines = sc.nextInt();
        System.out.println("Please note that mines are represented by the # 9 while -1 refers to 'hidden' spaces");
        System.out.println("");
        MinesweeperGame game = new MinesweeperGame(rows, columns, mines); // Creates the game
        System.out.println("");
        System.out.println("Let's get started!");
        int x = 0;
        while (x != -1) { // Actually plays the game
            System.out.println("");
            System.out.println("Please select a row | column to examine (zero-based indexing please): ");
            int inputRow = sc.nextInt();
            int inputColumn = sc.nextInt();
            int y = game.playerInteract(inputRow, inputColumn); // User input to select square
            if (y == 2) { // Response System: Win, Hit or Miss
                System.out.println("");
                System.out.println("You have hit a mine!");
                System.out.println("");
                game.getBoard();
                System.exit(0); // Exits after the game is complete
            }
            if (y == 1) {
                System.out.println("");
                System.out.println("You won! Congratulations");
                System.out.println("");
                game.getBoard();
                System.exit(0); // Exits after the game is complete
            }
            if (y == 0) {
                System.out.println("");
                System.out.println("Here is the board for reference. Play you next move wisely.");
                System.out.println("");
                game.getVisibleBoard(); // Continues if the game has not been completed. 
            }
        }
    }
}

Thank you to http://hilite.me/ for the source code formatting.

Github Code: https://github.com/MakeTheBrainHappy/Minesweeper

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