Abstract Classes Courses
École Polytechnique Fédérale de Lausanne via Coursera AP Computer Science A: Java Programming Polymorphism and Advanced Data Structures
Purdue University via edX Object Oriented Programming in Java
Microsoft via edX Inheritance and Data Structures in Java
University of Pennsylvania via Coursera Object Oriented Programming (OOPs) for JAVA Interviews
Udemy Java for Absolute Beginners
Udemy Object-Oriented Hierarchies in Java
LearnQuest via Coursera Laboratório de Programação Orientada a Objetos - Parte 1
Universidade de São Paulo via Coursera Ultimate Java Development and Certification Guide
Udemy Make a Postage Calculator with Scala
Coursera Project Network via Coursera