Matrix Multiplication

import java.util.Scanner;

/*
*   Program multiply two matrices
*   @author Steve Robinson
*   @see footyntech.wordpress.com
*/

class MatMul
{
    public static void main(String arg[])
    {
        int m,n,i,j;
        Scanner in=new Scanner(System.in);

        System.out.println("Enter the order of the first matrix [row, col]: ");
        m=in.nextInt();
        n=in.nextInt();
        int[][]matA=new int[m][n];
        System.out.println("Enter the elements of the matrix [row by row]: ");
        for(int a=0;a<m;a++)
            for(int b=0;b<n;b++)
                matA[a][b]=in.nextInt();

        System.out.println("Enter the order of the second matrix [row, col]: ");
        i=in.nextInt();
        j=in.nextInt();

        if(n!=i)
        {
            System.out.println("Invalid order. Multiplication Impossible!");
            System.exit(0);
        }

        int[][]matB=new int[i][j];
        int[][]matR=new int[m][j];
        System.out.println("Enter the elements of the second matrix [row by row]: ");
        for(int a=0;a<i;a++)
            for(int b=0;b<j;b++)
                matB[a][b]=in.nextInt();

        System.out.println("\nThe Matrix 1:");
        for(int a=0;a<m;a++)
        {
            for(int b=0;b<n;b++)
                System.out.print(matA[a][b]+" ");
            System.out.println();
        }

        System.out.println("\nThe Matrix 2:");
        for(int a=0;a<i;a++)
        {
            for(int b=0;b<j;b++)
                System.out.print(matB[a][b]+" ");
            System.out.println();
        }

        for(int a=0;a<m;a++)
            for(int b=0;b<j;b++)
            {
                matR[a][b]=0;
                for(int c=0;c<n;c++)
                    matR[a][b]+=matA[a][c]*matB[c][b];
            }

        System.out.println("\nThe Result of Multiplication:");
        for(int a=0;a<m;a++)
        {
            for(int b=0;b<j;b++)
                System.out.print(matR[a][b]+"  ");
            System.out.println();
        }


    }
}