1. DVP: Refactor and implement another stack.

You are going to make a second implementation of the stack interface, a linked stack.

The complete exercise description is in twostacks. The initial exam like project is in twostacks netbeans exam project.

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.

2.2. Lambda based calculator