The goal of this issue is to add a new concept to the Java track that introduces maps. The corresponding concept exercise can probably be based on the "High Score" exercise from the Elixir track.

Instructions on how to contribute to the Java track and how to implement concept exercises can be found in the contributing guide.

As always, leave a comment here if you want to work on this exercise, and we'll assign it to you. In case you have any further questions, feel free to ask here.