Sometimes you need to see some code to really understand how to apply a pattern. In this video, learn how to implement a design using the decorator pattern.
- [Female Instructor] Here's how we implement … Starbuzz Coffee using the decorator pattern. … Remember, our new design uses a common super class beverage … for both the coffees and the decorators. … And each decorator is composed … with the beverage it is wrapping. … We'll start at the top with the beverage class. … This is our component super class. … It implements a get description method … that returns the string unknown beverage. … But hopefully the concrete component classes … will override this to a better description. … And it specifies an abstract method cost … that subclasses must implement. … Now let's take a look at one of the concrete components. … These are the coffees that extend the beverage class. … For instance, the dark roast class extends beverage … and sets the description string it inherits from beverage … to dark roast coffee, … so we get a good description of the coffee. … Then, dark roast implements the cost method … and simply returns 99 cents, … which is the cost of a basic dark roast coffee …
- What are design patterns?
- Encapsulating code that varies with the Strategy pattern
- The limitations of inheritance
- Using the Adapter pattern
- Implementing the Observer pattern
- Extending behavior with composition and the Decorator pattern
- Encapsulating iteration with the Iterator pattern
- Object creation with the Factory Method pattern
- Using design principles to guide your object-oriented design
Skill Level Intermediate
1. Design Patterns
2. The Strategy Pattern
3. The Adapter Pattern
4. The Observer Pattern
Using the Observer pattern2m 23s
5. The Decorator Pattern
6. The Iterator Pattern
7. The Factory Patterns
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