59. 螺旋矩阵 II - 力扣（Leetcode）

MyCodes:

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import java.util.Scanner;

//螺旋矩阵II 59
class SpiralMatrixII59 {
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);

		System.out.print("请输入  n = ");

		int n = input.nextInt();

		int[][] res = generateMatrix(n);
		System.out.println("\n" + n + " 的螺旋矩阵为：");
		
		for(int[] itemGroup : res){
			for(int item : itemGroup){
				System.out.print(item + "\t");	
			}
			System.out.println();
		}
		input.close();
	}
	public static int[][] generateMatrix(int n) {
		int[][] res = new int[n][n];
		int start = 0;//起始点
		int loop = 0;//控制循环次数
		int count = 1;//填充 num
		int i,j;

		while (loop++ < n / 2){

			//上
			for (j = start; j < n - loop; j++){
				res[start][j] = count++;
			}
			//右
			for (i = start; i < n - loop; i++){
				res[i][j] = count++;
			}
			//下
			for (; j >= loop; j--){
				res[i][j] = count++;
			}
			//左
			for (; i >= loop; i--){
				res[i][j] = count++;
			}

			//改变起始点
			start++;
		}

		//n 为奇数，填充 （n/2, n/2）= n*n;
		if (n % 2 == 1) {
			res[start][start] = count;
		}
		return res;
    }
}