Source files as I gone through the Introduction to Computer Science from Tutsplus
Author: Andrew Perkins
Author URL: https://tutsplus.com/author/andrewperk/
URL: https://tutsplus.com/course/intro-to-computer-science-101/
URL: https://tutsplus.com/course/intro-to-computer-science-programming-with-java-201/
URL: https://tutsplus.com/course/intro-to-computer-science-programming-with-java-301/