How can I implement Sudoku in Java?

How can I implement Sudoku in Java?

To implement Sudoku in Java, you can start by creating a 9x9 grid to represent the board. You will need to define methods for checking valid moves, filling the board, and solving the puzzle.

What data structures should I use for the grid?

You can use a 2D array to represent the Sudoku grid. Each cell can hold an integer value from 1 to 9, or 0 for empty cells.

How do I check if a number can be placed in a specific cell?

You need to check the row, column, and 3x3 subgrid to ensure the number isn't already present. If it's absent in all three, it's valid.

Can you provide a simple code snippet for solving Sudoku?

Sure! Here's a basic backtracking algorithm to solve Sudoku:

public boolean solveSudoku(int[][] board) {
    for (int row = 0; row < 9; row++) {
        for (int col = 0; col < 9; col++) {
            if (board[row][col] == 0) {
                for (int num = 1; num <= 9; num++) {
                    if (isValid(board, row, col, num)) {
                        board[row][col] = num;
                        if (solveSudoku(board)) {
                            return true;
                        }
                        board[row][col] = 0; // backtrack
                    }
                }
                return false;
            }
        }
    }
    return true;
}