MakeRowColZero.java

public class MakeRowColZero {
    public static void main(String[] args) {
        int[][] matrix = {
                {1, 2, 0, 9},
                {3, 4, 1, 1},
                {0, 8, 1, 1},
                {7, 9, 1, 1}
        };

        makeRowColZero(matrix);
        printMatrix(matrix);
    }

    private static void makeRowColZero(int[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[0].length; j++) {
                if (matrix[i][j] == 0 && !isNeighboursZero(matrix, i, j)) {
                    addZeros(matrix, i, j);
                    break;
                }
            }
        }
    }

    private static boolean isNeighboursZero(int[][] matrix, int row, int col) {
        if (row == matrix.length - 1) {
            return matrix[row - 1][col] == 0;
        } else if (row == 0) {
            return matrix[row + 1][col] == 0;
        }

        return matrix[row - 1][col] == 0 && matrix[row + 1][col] == 0;
    }

    private static void addZeros(int[][] matrix, int row, int col) {
        for (int j = 0; j < matrix[0].length; j++) {
            matrix[row][j] = 0;
        }

        for (int i = 0; i < matrix.length; i++) {
            matrix[i][col] = 0;
        }
    }

    private static void printMatrix(int[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[0].length; j++) {
                System.out.print(matrix[i][j] + ", ");
            }
            System.out.println("");
        }
    }
}