转圈打印矩阵

给定一个整型矩阵matrix，请按照转圈的方式打印它。 例如：
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
打印结果为：1，2，3，4，8，12，16，15，14，13，9， 5，6，7，11， 10
【要求】 额外空间复杂度为O(1)。

Code

//coding=utf8                                                                                                         /*****************************************************
 @Author: Alex
 @Created Time : Tue 27 Aug 2019 08:48:30 AM CST

 @File Name: main.java
 @Blog: https://blog.csdn.net/weixin_43336281

 ****************************************************/

public class main{
    public static void PrintMatrix(int[][] matrix, int leftRow, int leftColumn, int rightRow, int rightColumn) {
        if (leftRow == rightRow) {
            for (int i = leftColumn; i < (rightColumn + 1); i++)
                System.out.println(matrix[leftRow][i] + " ");
        } else if (leftColumn == rightColumn) {
            for (int i = leftRow; i < (rightRow + 1); i++)
                System.out.println(matrix[i][leftColumn] + " ");
        } else {
            int curRow = leftRow, curColumn = leftColumn;

            for(; curColumn != rightColumn; curColumn++)
                System.out.println(matrix[leftRow][curColumn] + " ");
            for(; curRow != rightRow; curRow++)
                System.out.println(matrix[curRow][rightColumn]);
            for(; curColumn != leftColumn; curColumn--)
                System.out.println(matrix[rightRow][curColumn]);
            for(; curRow != leftRow; curRow--)
                System.out.println(matrix[curRow][leftColumn]);
        }
    }

    public static void CirclePrintingMatrix(int [][] matrix){
        int leftRow = 0, leftColumn = 0;
        int rightRow = matrix.length - 1, rightColumn = matrix[0].length - 1;

        while(leftRow < (rightRow + 1) && leftColumn < (rightColumn + 1))
            PrintMatrix(matrix, leftRow++, leftColumn++, rightRow--, rightColumn--);
    }

    public static void main(String[] args){
        int [][] matrix = {
            {1,2,3,4},
            {5,6,7,8},
            {9,10,11,12},
            {13,14,15,16}
        };
        CirclePrintingMatrix(matrix);
    }
}