You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Follow up:Could you do this in-place?

public class Solution {
    public void rotate(int[][] matrix) {
        int n = matrix.length;
        int[][] A = new int[n][n];
        for(int i=0;i<n;i++)
          for(int j=0;j<n;j++)
          {
              A[i][j] = matrix[i][j];
          }
          
        for(int i=0;i<n;i++)
          for(int j=0;j<n;j++)
          {         
              matrix[i][j] = A[n-j-1][i];                          
          }
        
    }
}