# Rotate Image

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) {
if (matrix == null) {
return;
}
int n = matrix.length;
for (int i = 0; i < n/2; i++) {
for (int j = i; j < n-1-i; j++) {
int temp = matrix[i][j];
matrix[i][j] = matrix[n-1-j][i];
matrix[n-1-j][i] = matrix[n-1-i][n-1-j];
matrix[n-1-i][n-1-j] = matrix[j][n-1-i];
matrix[j][n-1-i] = temp;
}
}
}
}
```

Hope this helps,

Michael