MagicSquarePlus.java

public class MagicSquarePlus {

      public void solve(int size, int start) {

            if (size < 1 || size % 2 == 0 || start < 1) {

                  throw new RuntimeException(

                              "Size must be add and Start must be positive.");

            }

            int[][] magic = new int[size][size];

            int row = size - 1;

            int col = size / 2;

            magic[row][col] = start;

            int last = size * size + start;

            for (int i = start + 1; i < last; i++) {

                  if (magic[(row + 1) % size][(col + 1) % size] == 0) {

                        row = (row + 1) % size;

                        col = (col + 1) % size;

                  } else {

                        row = (row - 1 + size) % size;

                  }

                  magic[row][col] = i;

            }

            display(magic, size, start);

      }

      private void display(int[][] magic, int size, int start) {

            int space = 2;

            int tmpSquare = size * size;

            while (tmpSquare > 0) {

                  tmpSquare = tmpSquare / 10;

                  space = space + 1;

            }

            int tmpStart = start;

            while (tmpStart > 0) {

                  tmpStart = tmpStart / 10;

                  space = space + 1;

            }

            for (int i = 0; i < size; i++) {

                  System.out.println();

                  for (int j = 0; j < size; j++) {

                        System.out.printf("%" + space + "d", magic[i][j]);

                  }

            }

      }

      public static void main(String[] args) {

            MagicSquarePlus ms = new MagicSquarePlus();

            ms.solve(3, 6);

      }

}