In last chapter, we overviewed the declaration syntax and some basic elements of Java programming language. In this chapter, we will see how those basic constructs can be used to implement some OOP concepts in Java. Object-oriented programming is a vast topic; it needs a dedicated book for complete understanding. This chapter will just overview few OOP concepts in the context of Java. If you know OOP already, it will be a quick revision. If you are new to object orientation itself, this chapter may serve as a curtain raiser for some important concepts, but you need further digging[§].