Java program to Perform Matrix Multiplication

//Java program to Perform Matrix Multiplication

import java.util.*;

 class multi

  {

       Scanner s=new Scanner(System.in);

       int a[][],b[][],r1,c1,r2,c2,i,j,k;

       public void get()  

       {

         System.out.println(" MATRIX MULTIPLICATION  ");

         System.out.println(" ~~~~~~ ~~~~~~~~~~~~~~ ");

         System.out.println("Enter the Number of Rows for first matrix   : ");

        r1=s.nextInt();

         System.out.println("Enter the Number of Column for first matrix : ");

        c1=s.nextInt();

         System.out.println("Enter the Number of Rows for Second matrix  : ");

        r2=s.nextInt();

         System.out.println("Enter the Number of Column for Second matrix : ");

        c2=s.nextInt();

       }

     if(c1!=r2)

    {

       System.out.println("Matrix multiplication is NOT POSSIBLE");

       return;

    }

     else

    {

        a=new int [r1][c1];

        b=new int [r2][c2];

        a=getdata(r1,c1);

        b=getdata(r2,c2);

                c=matrixmul(a,b,r1,c1,r2,c2);

                display(a,r1,c1);

        display(b,r2,c2);

        display(c,c1,r2);

    }

  int[][]getdata(int row,int col)

{

int a1[][];

a1=new int [row][col];

      for(i=0;i<row;i++)

      for(j=0;j<col;j++)

    {

     a[i][j]=s.nextInt();

    }

return a1;

}

void display(int a2[][],int row,int col)

{

     for(i=0;i<r2;i++)

     for(j=0;j<c2;j++)

     System.out.println(a2[i][j]+" ");

}

int[][]matrixmul(int a3[][],int a4[][],int x1,int y1,int x2,int y2)

{

int res[][];

res=new int [y1][x2];

      for(i=0; i<x2; i++)

     {

      for(j=0; j<y1; j++)

      {

                res[i][j]=0;

                for(k=0;k<y2;k++)

        res[i][j]+=a3[i][k]*a4[k][j];

      }

     }

    return res;

}

}

    class mat

{

public static void main(String args[])

 {

 matrixmul m=new matrixmul();

                m.get();

             m.display();

 }

}