public class Sudoku {
    private int[][] grid = new int[9][9];
    private int col;
    private int row;

    public boolean solveSudoku() {
        if(!(this.FindEmptyCell())) {
            return true;
        }

        for(int num = 1; num <= 9; num++) {
            if(this.isPossible(this.col, this.row, num)) {
                this.grid[this.col][this.row] = num;
                if(this.solveSudoku()) {
                    return true;
                }
                this.grid[col][row] = 0;
            }
        }
        return false;
    }
}

1 2 3 4 5 6 7 8 9
4 5 6 1 2 3 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0