Dynamic Features:?
- Add functionality to dynamically change the properties of the decorated
object. For instance, you could add a feature to customize the size of the
coffee (Small, Medium, Large) which would change both the cost and
description.
Visual Diagram:
+-------------------------+
| ICoffee | <-- Component Interface
+-------------------------+
/ \
+-------------------------+
| SimpleCoffee | <-- Concrete Component (Core Coffee)
+-------------------------+
+---------------------+ +----------------------+
| CoffeeDecorator |<--- | MilkDecorator |
+---------------------+ +----------------------+
| |
Follow:
+---------------------+ +----------------------+
| SugarDecorator | <-- | WhippedCreamDecorator |
+---------------------+ +----------------------+
- SimpleCoffee is the base coffee object.
- MilkDecorator and SugarDecorator are decorators that extend the behavior of
SimpleCoffee.
Conclusion:
The Decorator Pattern provides a powerful and flexible way to extend the functionality of
objects at runtime. In real-time applications like customizing a coffee order, decorating UI
elements, or adding functionality to text, this pattern helps in achieving clean, modular, and
extensible code. You can add or remove features dynamically, ensuring that your base
classes remain unaltered and your system remains flexible for future extensions.
Facade Pattern: Real-Time Example - Simplifying a Home Theater
System
Definition:
The Facade Pattern provides a simplified interface to a complex subsystem, making it
easier for clients to interact with multiple components. It hides the complexity of the
subsystem and exposes only what is necessary, offering a higher-level interface to users.
Use Case:
A common example is a home theater system, where the user needs to interact with
multiple components like an amplifier, DVD player, or projector. The Facade Pattern
simplifies the process by providing a unified interface to these various components, making
the system easier to use.
Code Explanation: