1. DVP: Refactor and implement another stack.
2. Lambda time.
2.1. Refactor comparator solution from week1
Copy the project into week 4 and refactor the compataror implementations to lambda expressions and see how easy they are.
If you had problems with you own implementations or ar curious how we teachers implement such a class, have a glance in the solution of the exercise in week 1 in the repository at comparePersons project.