打印图形

    int i=5;  
    1   2  3  4  5  
   16 17 18 19 6  
   15 24 25 20 7  
   14 23 22 21 8  
   13 12 11 10 9  
      
   int i=6  
   1  2   3  4   5  6  
  20 21 22 23 24  7  
  19 32 33 34 25  8  
  18 31 36 35 26  9  
  17 30 29 28 27 10  
  16 15 14 13 12 11  

public static void print(int N)
    {
        int a[][] = new int[N][N];
        int i = 0, j = 0;
        int count = 1;
        for (i = 0; i < N; i++)
        {
            for (j = 0; j < N; j++)
            {
                a[i][j] = 0;
            }
        }
        i = 0;
        j = 0;
        for (int k = 0; k <= N / 2; k++)
        {
            i = k;
            j = k;
            for (i = k; i < N - k; i++)
            {
                a[j][i] = count;
                count++;
            }
            i = N - k - 1;
            for (j = k + 1; j < N - k; j++)
            {
                a[j][i] = count;
                count++;
            }
            j = N - k - 1;
            for (i = N - k - 2; i >= k; i--)
            {
                a[j][i] = count;
                count++;
            }
            i = k;
            for (j = N - k - 2; j >= 1 + k; j--)
            {
                a[j][i] = count;
                count++;
            }
        }
        
        for (i = 0; i < N; i++)
        {
            for (j = 0; j < N; j++)
            {
                if (a[i][j]<N)
                {
                    System.out.print(" "+a[i][j] + " ");
                }
                else
                {
                    System.out.print(a[i][j] + " ");
                }
            }
            System.out.println();
        }
    }