Jan 17 - Rotate Image; 2D Array; xPos and yPos;

public class Solution {
    public void rotate(int[][] matrix) {
        int n = matrix.length;
        for(int i = 0; i < n/2; i++){
            int num = n-i*2;
            for(int j = 0; j < num-1; j++){
                int temp = matrix[i][i+j];
                matrix[i][i+j] = matrix[i+num-1-j][i];
                matrix[i+num-1-j][i] = matrix[i+num-1][i+num-1-j];
                matrix[i+num-1][i+num-1-j] = matrix[i+j][i+num-1];
                matrix[i+j][i+num-1] = temp;
            }
        }
    }
}