Matrix subtraction.

Here’s an example program in Java that performs matrix subtraction:

  import java.util.Arrays;

  public class MatrixSubtraction {

    public static void main(String[] args) {

        int[][] matrix1 = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };

        int[][] matrix2 = { { 9, 8, 7 }, { 6, 5, 4 }, { 3, 2, 1 } };

        int[][] result = subtractMatrices(matrix1, matrix2);

        System.out.println("Matrix1:");

        printMatrix(matrix1);

        System.out.println("Matrix2:");

        printMatrix(matrix2);

        System.out.println("Subtraction Result:");

        printMatrix(result);

    }

    public static int[][] subtractMatrices(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 printMatrix(int[][] matrix) {

        for (int[] row : matrix) {

            System.out.println(Arrays.toString(row));

        }

        System.out.println();
    }
}

In this program, the `subtractMatrices` function takes two matrices as input and returns their subtraction. The `printMatrix` function is used to display the matrices.

The program creates two matrices `matrix1` and `matrix2` and performs subtraction using the `subtractMatrices` function. It then displays the original matrices and the subtraction result.

When you run this program, the output will be:

Matrix1:

[1, 2, 3]

[4, 5, 6]

[7, 8, 9]

Matrix2:

[9, 8, 7]

[6, 5, 4]

[3, 2, 1]

Subtraction Result:

[-8, -6, -4]

[-2, 0, 2]

[4, 6, 8]

This demonstrates matrix subtraction, where each corresponding element of the two matrices is subtracted to obtain the result.