Java Program to Add Two Matrices

This article covers a program in Java, that find and prints the addition result of any two given matrices entered by user at run-time of the program. The first program is created based on 3*3 matrices, whereas the third is created based on m*n matrices.

If you're not aware about, how the matrix addition performs ?
Then refer to Matrix Addition Rules. Now let's move on, and create a program in Java to add two matrices.

Addition of Two Matrix in Java using 2D Array

The question is, write a Java program to perform addition of two 3*3 matrices. Elements of both matrices must be received by user at run-time. The program given below is its answer. This program uses 2D array to do the job.

import java.util.Scanner;

public class fresherearth
{
   public static void main(String[] args)
   {
      int i, j;
      int[][] a = new int[3][3];
      int[][] b = new int[3][3];
      int[][] c = new int[3][3];
      
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter 9 elements for first matrix: ");
      for(i=0; i<3; i++)
      {
         for(j=0; j<3; j++)
         {
            a[i][j] = s.nextInt();
         }
      }
      
      System.out.print("Enter 9 elements for second matrix: ");
      for(i=0; i<3; i++)
      {
         for(j=0; j<3; j++)
         {
            b[i][j] = s.nextInt();
         }
      }
      
      for(i=0; i<3; i++)
      {
         for(j=0; j<3; j++)
         {
            c[i][j] = a[i][j] + b[i][j];
         }
      }
      
      System.out.println("\n----Addition Result----");
      for(i=0; i<3; i++)
      {
         for(j=0; j<3; j++)
         {
            System.out.print(c[i][j]+ " ");
         }
         System.out.print("\n");
      }
   }
}

The sample run of above program with user input 1, 2, 3, 4, 5, 6, 7, 8, 9 as nine elements for first, whereas 9, 8, 7, 6, 5, 4, 3, 2, 1 as nine elements for second matrix, is shown in the snapshot given below:

The above program, can also be created in this way:

import java.util.Scanner;

public class fresherearth
{
   public static void main(String[] args)
   {
      int i, j;
      int[][] a = new int[3][3];
      int[][] b = new int[3][3];
      int[][] c = new int[3][3];
      
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter 9 elements for first matrix: ");
      for(i=0; i<3; i++)
      {
         for(j=0; j<3; j++)
            a[i][j] = s.nextInt();
      }
      
      System.out.print("Enter 9 elements for second matrix: ");
      for(i=0; i<3; i++)
      {
         for(j=0; j<3; j++)
         {
            b[i][j] = s.nextInt();
            c[i][j] = a[i][j] + b[i][j];
         }
      }
      
      System.out.println("\n----Addition Result----");
      for(i=0; i<3; i++)
      {
         for(j=0; j<3; j++)
            System.out.print(c[i][j]+ " ");
         System.out.print("\n");
      }
   }
}

Addition of Two Matrices of Specified Orders in Java

Since the previous program is limited to the matrix of 9 elements only. Therefore, I've modified and created a new one, that allows user to define the size of both the matrices too, along with their elements.

import java.util.Scanner;

public class fresherearth
{
   public static void main(String[] args)
   {      
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the Row Size of First Matrix: ");
      int rowOne = s.nextInt();
      System.out.print("Enter the Column Size of First Matrix: ");
      int colOne = s.nextInt();
      int[][] matrixOne = new int[rowOne][colOne];
      
      System.out.print("Enter " +rowOne*colOne+ " Elements of First Matrix: ");
      for(int i=0; i<rowOne; i++)
      {
         for(int j=0; j<colOne; j++)
            matrixOne[i][j] = s.nextInt();
      }
      
      System.out.print("Enter the Row Size of Second Matrix: ");
      int rowTwo = s.nextInt();
      System.out.print("Enter the Column Size of Second Matrix: ");
      int colTwo = s.nextInt();
      
      if(rowOne==rowTwo && colOne==colTwo)
      {
         int[][] matrixTwo = new int[rowTwo][colTwo];
         int[][] matrixThree = new int[rowTwo][colTwo];
         
         System.out.print("Enter " +rowTwo*colTwo+ " Elements of Second Matrix: ");
         for(int i=0; i<rowTwo; i++)
         {
            for(int j=0; j<colTwo; j++)
            {
               matrixTwo[i][j] = s.nextInt();
               matrixThree[i][j] = matrixOne[i][j] + matrixTwo[i][j];
            }
         }
         
         System.out.println("\n----Addition Result----");
         for(int i=0; i<rowTwo; i++)
         {
            for(int j=0; j<colTwo; j++)
               System.out.print(matrixThree[i][j]+ "\t");
            System.out.print("\n");
         }
      }
      else
         System.out.println("\nOrder Mismatched!\nAddition not possible.");
   }
}

Here is its sample run with user inputs, 2 and 3 as row and column size, 1, 2, 3, 4, 5, 6 as six elements of first matrix. 2 and 3 as row and column size, 7, 8, 9, 10, 11, 12 as six elements of second matrix:

Same Program in Other Languages

Java Online Test

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