Decorator design pattern by premaseem · Pull Request #26 · premaseem/DesignPatternsJava9

… resulting in too many classes

…eating class for each option.

Benefits
1. Lean code - as its not required to create class for each option
2. Price can be calculated dynamically
3. Performance improvement
4. Loose coupling.
5. Easy to update - price of can be updated at one place without touching other classes.