Learn Java with Math: Using Fun Projects and Games

© Ron Dai 2019

R. DaiLearn Java with Mathhttps://doi.org/10.1007/978-1-4842-5209-3_27

27. Encapsulation and Polymorphism

Ron Dai¹ 

(1)

Seattle, WA, USA

 

In addition to “abstraction” and “inheritance,” there are another two principles in OOP, “encapsulation” and “polymorphism.”

Encapsulation

You may have heard the phrase “information hiding,” which intends to conceal the detailed implementations of an object behind a higher level of abstraction. Information hiding is mainly for security concerns, while encapsulation is to keep data and class implementation details inside a class for complexity concerns. However, encapsulation combines internal data and methods and enables its internal data to be accessible from outside through its public methods. And ...