Transpose in a java pgm

Transpose.java

public class Transpose

{

               public static void main(String[] args)

               {

        int N = Integer.parseInt(args[0]);

        int[][] a = new int[N][N];

        for (int i = 0; i < N; i++)

   {

            for (int j = 0; j < N; j++)

    {

                a[i][j] = N*i + j;

            }

        }

        System.out.println("Before");

        System.out.println("------");

        for (int i = 0; i < N; i++)

        {

            for (int j = 0; j < N; j++)

        {

                System.out.printf("%4d", a[i][j]);

            }

            System.out.println();

        }

        for (int i = 0; i < N; i++)

         {

            for (int j = i+1; j < N; j++)

        {

                int temp = a[i][j];

                a[i][j] = a[j][i];

                a[j][i] = temp;

            }

        }

        System.out.println();

        System.out.println("After");

        System.out.println("------");

        for (int i = 0; i < N; i++)

        {

            for (int j = 0; j < N; j++)

         {

                System.out.printf("%4d", a[i][j]);

            }

            System.out.println();

        }

    }

}