10.Interface matrix

import java.util.*;
import java.lang.*;
interface Matrix
{
    int m=3,n=3;
    void accept();
    void display();
    void add();
    void multiply();
}
class methods implements Matrix
{
    protected int i,j,k;
    int a[][] = new int[m][n];
    int b[][] = new int[m][n];
    int c[][] = new int[m][n];
    public void accept()
    {
        Scanner t = new Scanner(System.in);
        System.out.println("enter elements in 1st matrix");
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                a[i][j] = t.nextInt();
            }
        }
        System.out.println("enter elements in 2nd matrix");
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                b[i][j] = t.nextInt();
            }
        }
    }
    public void display()
    {
        System.out.println(" 1st Matrix is ");
        System.out.println();
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                System.out.print(a[i][j]+"  ");
            }
            System.out.println();
        }
        System.out.println(" 2nd Matrix is ");
        System.out.println();
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                System.out.print(b[i][j]+"  ");
            }
            System.out.println();
        }
    }
    public void add()
    {
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                c[i][j] = a[i][j]+b[i][j];
            }
        }
        System.out.println("Addition of two Matrix is ");
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                System.out.print(c[i][j]+"  ");
            }
            System.out.println();
        }
    }
    public void multiply()
    {
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                c[i][j]=0;
                for(k=0;k<n;k++)
                {
                    c[i][j] = c[i][j]+a[i][k]*b[k][j];
                }
            }
        }
        System.out.println("Multiplication of two Matrix is ");
        System.out.println();
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                System.out.print(c[i][j]+"  ");
            }
            System.out.println();
        }
    }
}
class test extends methods
{
    public static void main(String args[])
    {
        methods xyz = new methods();
        xyz.accept();
        xyz.display();
        xyz.add();
        xyz.multiply();
    }
}