Question

Program to sort non-boundary elements of matrix in descending order .

Matrix =  [5, 2, 9, 8, 7]
          [9, 6, 4, 2, 3]
          [3, 8, 1, 3, 9]
          [1, 2, 3, 4, 5]

SORTED MATRIX
[5, 2, 9, 8, 7]
[9, 8, 6, 4, 3]
[3, 3, 2, 1, 9]
[1, 2, 3, 4, 5]

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Code

import java.util.Scanner;
public class SortNonBoundaryElementsOfMatrix
{
    public static void main(String[] args)
    {
        int row=0,col=0,i=0,j=0,k=0,temp=0,count=0;
        int arr[][],b[];

        Scanner sc=new Scanner(System.in);
        System.out.println("ENTER THE NUMBER OF ROW OF MATRIX");
        row=sc.nextInt();
        System.out.println("ENTER THE NUMBER OF COLUMN OF MATRIX");
        col=sc.nextInt();

        arr=new int[row][col];
        System.out.println("ENTER THE ELEMENTS IN MATRIX");
        for(i=0;i< row;i++)
        {
            for(j=0;j< col;j++)
            {
                arr[i][j]=sc.nextInt();
                /*counting the number of non-boundary elements*/

                if(i!=0&&i!=(row-1)&&j!=0&&j!=(col-1))
                {
                    count++;
                }
            }
        }
        b=new int[count];
        System.out.println("ORIGINAL MATRIX");
        for(i=0;i< row;i++)
        {
            for(j=0;j< col;j++)
            {
                System.out.print(arr[i][j]+" ");

            }
            System.out.println();
        }

        for(i=0;i< row;i++)
        {
            for(j=0;j< col;j++)
            {
                if(i!=0 &&j!=0&&i!=(row-1)&&j!=(col-1))
                {
                    b[k]=arr[i][j];
                    k++;
                }
            }
        }

        /*sorting one-dimensional array*/
        for(i=0;i< b.length;i++)
        {
            for(j=0;j< b.length;j++)
            {
                if(b[i] > b[j])
                {
                    temp=b[i];
                    b[i]=b[j];
                    b[j]=temp;
                }
            }
        }

        k=0;
        for(i=0;i< row;i++)
        {
            for(j=0;j< col;j++)
            {
                if(i!=0 &&j!=0&&i!=(row-1)&&j!=(col-1))
                {
                    arr[i][j]=b[k];
                    k++;
                }
            }
        }

        System.out.println("SORTED MATRIX");
        for(i=0;i< row;i++)
        {
            for(j=0;j< col;j++)
            {
                System.out.print(arr[i][j]+" ");

            }
            System.out.println();
        }

    }
}