HGBase Code (Desktop)

Removed code smell.

Generic methods to write/read a collection or a map to/from an XML file.

Added setter for first and second and constructor for empty pair.

Java doc corrected.

Documentation and formatting.

Added a functional interface for a consumer which accepts three arguments.

Utility method to check if a value is in a list of possible values.

Removed code smells.

Reformatted code.

Method to pick a random element from an array.