Odd Magic Square

package cse202;

public class MagicSquare {

    void oddMagicSquare(int dim) {
        if (dim == 0) {
            System.out.println("Zero Dimenssion Magic Square Is Not Possible.");
        } else if (dim % 2 == 1) {

            int[][] a = new int[dim+1][dim+1];

            a[0][dim] = -3;

            for (int r = 0; r <= dim; r++) {
                for (int c = 0; c <= dim; c++) {
                    if (r == 0 && c != dim) {
                        a[r][c] = -1;
                    } else if (c == dim && r != 0) {
                        a[r][c] = -2;
                    }
                }
            }

            int value = 1;
            int maxRow = dim;
            int r = 1;
            int c = (int)(dim/2);

            while (value != (dim * dim) + 1) {
                if (a[r][c] == -1) {
                    r = maxRow;
                    a[r][c] = value;
                } else if (a[r][c] == -3) {
                    r = r + 2;
                    c = c - 1;
                    a[r][c] = value;
                } else if (a[r][c] == -2) {
                    c = 0;
                    a[r][c] = value;
                } else if (a[r][c] != 0 && a[r][c] != -1 && a[r][c] != -2 && a[r][c] != -3) {
                    r = r + 2;
                    c = c - 1;
                    a[r][c] = value;
                } else if (a[r][c] == 0) {
                    a[r][c] = value;
                }
                r = r - 1;
                c = c + 1;
                value++;
            }

            for (int i = 1; i <= dim; i++) {
                for (int j = 0; j < dim; j++) {
                    System.out.print(a[i][j] + " ");
                }
                System.out.println("");
            }
        }else{
            System.out.println("Magic Square Dimenssion Should Be Odd Number.");
        }
    }
}