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What is Decorator Design Pattern

Decorator pattern allows a user to add new functionality to an existing object without altering its structure.This pattern creates a decorator class which wraps the original class and provides additional functionality keeping the class methods signature intact.

Diagram

Diagram

Diagram

Diagram

When to use Decorator Design Pattern

When you want to get rid of too many sub classes by creating separate class for each combination.

Learn Design Patterns with Java by Aseem Jain

This repository contains working project code used in video Course by Packt Publication with title "Learn Design Patterns with Java " authored by "Aseem Jain".

Course link:

https://www.packtpub.com/application-development/learn-design-patterns-java-9-video

http://in.linkedin.com/in/premaseem Profile: http://in.linkedin.com/in/premaseem

Authors blog on design patterns:

https://premaseem.wordpress.com/category/computers/design-patterns/

Software Design pattern community face book page:

https://www.facebook.com/DesignPatternGuru/

Note:

  • This code base will work on Java 9 and above versions.
  • diagrams folders carry UML diagrams.
  • pattern folder has code of primary example.
  • patternBonus folder has code of secondary or bonus example.