We can add two matrices in java using multi-dimensional arrays. In java “array of arrays “ approach is used for create multi-dimensional array
Examples:
We have two matrices A and B of same size, and we have to add them in Java by traverse each element of the two matrices. Store this sum in the new matrix at the corresponding index.
Input: A[][] = {{3, 5},{2, 7}}
B[][] = {{3, 2},{2, 1}}
Output: {{6, 7},{4, 8}}
Example – Program to adding two matrices
public class AddingTwoMatrices {
public static void main(String args[]) {
int A[][] = { { 3, 5 }, { 2, 7 } };
int B[][] = { { 3, 2 }, { 2, 1 } };
int C[][] = new int[2][2]; //2 rows and 2 columns
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
C[i][j] = A[i][j] + B[i][j];
System.out.print(C[i][j] + " ");
}
System.out.println();
}
}
}
Output
6 7
4 8
Example – Using independent method
public class AddingTwoMatrices {
public static void main(String[] args) {
int a[][] = { { 3, 5 }, { 2, 7 } };
int b[][] = { { 3, 2 }, { 2, 1 } };
int[][] sum = addMatrices(a, b);
System.out.println("The sum of two matrices is: ");
printMatrix(sum);
}
public static int[][] addMatrices(int[][] a, int[][] b) {
int rows = a.length;
int columns = a[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] = a[i][j] + b[i][j];
}
}
return result;
}
public static void printMatrix(int[][] matrix) {
int rows = matrix.length;
int columns = matrix[0].length;
for (int i = 0; i < rows; i++) {
for (int j = 0; j < columns; j++) {
System.out.print(matrix[i][j] + " ");
}
System.out.println();
}
}
}
Output
The sum of two matrices is:
6 7
4 8
