There are three major features in object-oriented programming that makes them different than non-OOP languages: encapsulation, inheritance and polymorphism. Encapsulation Enforces Modularity ...

We also learned how to use inheritance and polymorphism to speed up our code implementation time and to isolate bugs, which makes our code maintenance tasks much easier.

Compare inheritance and composition, the two fundamental ways to relate Java classes, then practice debugging ClassCastExceptions in Java inheritance.

Java’s interface language feature confuses many Java newbies. Many mistakenly assume that interfaces only sidestep Java’s failure to support multiple implementation inheritance.