Java Design Patterns: A Hands-On Experience with Real-World Examples

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

V. SarcarJava Design Patternshttps://doi.org/10.1007/978-1-4842-7971-7_9

9. Decorator Pattern

Vaskaran Sarcar¹  

(1)

Garia, Kolkata, India

 

This chapter covers the Decorator pattern, which is also known as the Wrapper pattern.

GoF Definition

It attaches additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.

Concept

An alternative to inheritance is composition. It is quite common in programming and often gives you a better payoff. This chapter shows a useful case study on this topic using some wrappers.

So, what is a wrapper(or a decorator)? A wrapper is like a topping that surrounds ...