CODE EXAMPLE FOR JAVA

multiplication of two matrices java

// Java program to multiply two square
// matrices.
import java.io.*;
  
class GFG {
  
    static int N = 4;
  
    // This function multiplies mat1[][]
    // and mat2[][], and stores the result
    // in res[][]
    static void multiply(int mat1[][],
                         int mat2[][], int res[][])
    {
        int i, j, k;
        for (i = 0; i < N; i++) {
            for (j = 0; j < N; j++) {
                res[i][j] = 0;
                for (k = 0; k < N; k++)
                    res[i][j] += mat1[i][k]
                                 * mat2[k][j];
            }
        }
    }
  
    // Driver code
    public static void main(String[] args)
    {
        int mat1[][] = { { 1, 1, 1, 1 },
                         { 2, 2, 2, 2 },
                         { 3, 3, 3, 3 },
                         { 4, 4, 4, 4 } };
  
        int mat2[][] = { { 1, 1, 1, 1 },
                         { 2, 2, 2, 2 },
                         { 3, 3, 3, 3 },
                         { 4, 4, 4, 4 } };
  
        // To store result
        int res[][] = new int[N][N];
        int i, j;
        multiply(mat1, mat2, res);
  
        System.out.println("Result matrix"
                           + " is ");
        for (i = 0; i < N; i++) {
            for (j = 0; j < N; j++)
                System.out.print(res[i][j]
                                 + " ");
            System.out.println();
        }
    }
}
  
// This code is contributed by anuj_67.