Matrix addition.

Here’s a Java program that performs matrix addition:

   import java.util.Scanner;

    public class MatrixAddition {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the number of rows: ");

        int rows = scanner.nextInt();

        System.out.print("Enter the number of columns: ");

        int columns = scanner.nextInt();

        int[][] matrix1 = new int[rows][columns];

        int[][] matrix2 = new int[rows][columns];

        System.out.println("Enter the elements of the first matrix:");

        enterMatrixElements(scanner, matrix1);

        System.out.println("Enter the elements of the second matrix:");

        enterMatrixElements(scanner, matrix2);

        int[][] resultMatrix = addMatrices(matrix1, matrix2);

        System.out.println("The sum of the matrices is:");

        displayMatrix(resultMatrix);

    }

    public static void enterMatrixElements(Scanner scanner, int[][] matrix) {

        for (int i = 0; i < matrix.length; i++) {

            for (int j = 0; j < matrix[0].length; j++) {

                System.out.print("Enter element [" + (i + 1) + "][" + (j + 1) + "]: ");

                matrix[i][j] = scanner.nextInt();

            }
       }

    }

    public static int[][] addMatrices(int[][] matrix1, int[][] matrix2) {

        int rows = matrix1.length;

        int columns = matrix1[0].length;

        int[][] result = new int[rows][columns];

        for (int i = 0; i < rows; i++) {

            for (int j = 0; j < columns; j++) {

                result[i][j] = matrix1[i][j] + matrix2[i][j];

            }

        }

        return result;

    }

    public static void displayMatrix(int[][] matrix) {

        for (int[] row : matrix) {

            for (int element : row) {

                System.out.print(element + " ");

            }

            System.out.println();

        }
    }
}

In this program, the `main` method asks the user to enter the number of rows and columns for the matrices. It then creates two matrices (`matrix1` and `matrix2`) based on the user input.

The `enterMatrixElements` method is used to prompt the user to enter the elements for each matrix. It takes a `Scanner` object and the matrix as parameters and populates the matrix with the user’s input.

The `addMatrices` method performs the actual matrix addition. It takes two matrices as input, creates a new matrix called `result`, and fills it with the sum of the corresponding elements from `matrix1` and `matrix2`.

The `displayMatrix` method is used to print the elements of a matrix in a readable format.

After the matrices are created and filled, the program calls `addMatrices` to compute the sum and then displays the result using the `displayMatrix` method.

I hope this helps! Let me know if you have any further questions.