We discuss the idea of classes and objects, you are to be introduced to the basic OOP principles - data hiding, encapsulation, inheritance, abstraction and polymorphism, as well as the relations between classes - association, aggregation and composition. The lectures are structured in a way to let you move in pace with the instructor, applying everything you have just seen by yourself. Java is an Object Oriented Programming (OOP) language. Mastering OOP concepts and know how to apply those concepts into programming is trivial skills if you want to be a Java professional - so, why not making the first step now?