BlueJ Program to check for identity matrix

A matrix is known as identity matrix in which all diagonal elements are 1. In this BlueJ program, a matrix will be checked whether it is identity matrix or not.

import java.util.*;

class Search

{

    int i,j;

    int arr[][]=new int[5][5];

    Scanner sc=new Scanner(System.in);

public void take()

{

     for(int i=0;i< =4;i++)

    {

          for(j=0;j< =4;j++)

           {

               System.out.print("\nValue: ");

                arr[i][j]=sc.nextInt();

            }

        }

      

    }

    public void show()

    {

        int x=0;

       

        System.out.println("\nEntered Matrix Values.");

        for(i=0;i< =4;i++)

         {

              for(j=0;j< =4;j++)

              {

                  System.out.print(" "+arr[i][j]);

                }

                System.out.println();

            }

         for(i=0;i< =4;i++)

         {

              for(j=0;j< =4;j++)

              {

                  if(i==j && arr[i][j]!=1 || i+j==4 && arr[i][j]!=1)

                  x=1;

                }

            }

            if(x==0)

             System.out.print("\nIdentity Matrix.");

             else

            System.out.print("\nNot Identity Matrix.");

}

      

    public static void main(String args[])

    {

        Search ob=new Search();

        ob.take();

        ob.show();

   }

 }