public class SpiralMatrix {
    public static void main(String[] args) {
        SpiralMatrix sm = new SpiralMatrix();
        int[][] ints = sm.generateMatrix3(3);
        for (int[] anInt : ints) {
            for (int i : anInt) {
                System.out.print(i + "\t");
            }
            System.out.println();
        }
    }
    public int[][] generateMatrix3(int n) {
        int num = 1;
        int[][] matrix = new int[n][n];     //定义一个二维数组
        int left = 0, right = n - 1, top = 0, bottom = n - 1;       //按层模拟
        while (left <= right && top <= bottom) {
//            将第一行赋值完成
            for (int column = left; column <= right; column++) {//column列
                matrix[top][column] = num;
                num++;
            }
//            将第二行赋值
            for (int row = top + 1; row <= bottom; row++) { //row行
                matrix[row][right] = num;
                num++;
            }
            if (left < right && top < bottom) {
                for (int column = right - 1; column > left; column--) {
                    matrix[bottom][column] = num;
                    num++;
                }
                for (int row = bottom; row > top; row--) {
                    matrix[row][left] = num;
                    num++;
                }
            }
            left++;
            right--;
            top++;
            bottom--;
        }
        return matrix;
    }
}