Define the method equals for the window class . two windows will be considered equal if they are the same size and at the same position

Equating "equal" as symmetrical:
 
Two windows of the same size and placed in the same position is considered symmetrical. In an example where one window is placed at a certain distance from a wall and a certain distance from the floor, another window of the same size is also placed in the opposite side of the first window (based on a constant center) with the same distance from the floor and wall. The two windows can be considered equal.