JAvaスパイラルマトリクス

public class Sequence {

	public static void main(String[] args) {

		int n = 5;

		// 0:  ,1:  ,2:  ,3：  
		int direction = 0;

		//  ， 
		int row = 0, col = 0;

		int num = 0;

		int[] array = new int[n * n];
		while (array[row * n + col] == 0) {
			num++;
			array[row * n + col] = num;
			switch (direction) {
			case 0:
				col++;
				break;
			case 1:
				row++;
				break;
			case 2:
				col--;
				break;
			case 3:
				row--;
				break;
			}
			if (row == n || col == n || row == -1 || col == -1
					|| array[row * n + col] != 0) {
				direction++;
				if (direction == 4)
					direction = 0;
				switch (direction) {
				case 0:
					row++;
					col++;
					break;
				case 1:
					row++;
					col--;
					break;
				case 2:
					row--;
					col--;
					break;
				case 3:
					row--;
					col++;
					break;
				}
			}
		}

		for (int i = 0; i < n; i++) {
			for (int j = 0; j < n; j++) {
				System.out.printf("%-3s", array[i * n + j]);
			}
			System.out.println();
		}
	}
}

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