Today, C++, C#, Java, Visual Basic.NET and Python are popular object-oriented languages. The following compares basic OOP terms with traditional programming. See object-oriented DBMS.

In Java, polymorphism results in code that is more concise and easier to maintain. This tutorial provides an overview of the four types of Java polymorphism, but our focus is subtype polymorphism.

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