Design pattern: Observer

[stephaniesaab]

An opportunity for a design pattern is to include an 'observer' design pattern in the 'Item' class. All items can watch for a change in the User's points and then once the User's points reaches a certain amount they will change from locked to unlocked. This will also make the lock/unlock method more secure because it will be able to work as a private method, so that not any class can go around changing its private attributes.