April 2019
Intermediate to advanced
360 pages
9h 17m
English
Content preview from Hands-On Design Patterns with Java
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Learning about abstraction
Abstraction is one of the core principles of Object-Oriented Programming (OOP) and is used to hide object implementation details. It is important to understand abstraction to support correct implementation.
An example of abstraction is when we have an abstract User class and multiple subclasses that inherit from it. For example, we might have a Learning Management System (LMS) User class and three subclasses—Student, Teacher, and Administrator. We can implement a method overriding the inherited methods that would otherwise expose the implementation details. More specifically, the superclass defines the methods and the subclasses implement them.
As you can see in the following UML diagram, the Student, Teacher, and ...
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