Matrix multiplication java

Hey guys!! Welcome to flower brackets blog. In this post we are going to learn matrix multiplication java.

matrix multiplication java

Also read – matrix addition and subtraction in java

In java, to perform a matrix multiplication, column of the first matrix should be equal to row of the second matrix. Let’s see java program,

import java.util.Scanner;

public class MatrixMultiplicationInJava 
{
   public static void main(String[] args) 
   { 
      int row, column, a, b, total = 0, x, y, z;
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter no. of rows and columns : ");
      row = sc.nextInt();
      column = sc.nextInt();

      int matrix1[][] = new int[row][column];
      System.out.println("Please enter elements of matrix1 : ");
      for(x = 0; x < row; x++)
      {
         for(y = 0; y < column; y++)
         {
            matrix1[x][y] = sc.nextInt();
         }
      } 
      System.out.println("Please enter no. of rows and columns : ");
      a = sc.nextInt();
      b = sc.nextInt();

      if(column != a)
      {
         System.out.println("Matrices can't be multiplied!!");
      }
      else
      {
         int matrix2[][] = new int[a][b];
         int multiply[][] = new int[row][b];
         System.out.println("Please enter elements of matrix2 : ");
         for(x = 0; x < a; x++)
         {
            for(y = 0; y < b; y++)
            {
               matrix2[x][y] = sc.nextInt();
            }
         } 
         for(x = 0; x < row; x++)
         {
            for(y = 0; y < b; y++)
            { 
               for(z = 0; z < a; z++)
               {
                  total = total + matrix1[x][z] * matrix2[z][y];
               }
               multiply[x][y] = total;
               total = 0;
            }
         }

         System.out.println("Multiplication of matrices : ");
         for(x = 0; x < row; x++)
         {
            for(y = 0; y < b; y++)
            {
               System.out.print(multiply[x][y] + "\t");
            }
            System.out.print("\n");
         }
      }
      sc.close();
   }
}

Output:

Please enter no. of rows and columns : 3 3
Please enter elements of matrix1 :
2 4 6
8 2 4
6 8 2
Please enter no. of rows and columns : 3 3
Please enter elements of matrix2 :
1 3 5
7 9 1
3 5 7
Multiplication of matrices :
48 72 56
34 62 70
68 100 52

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