This video walks through the solution to the pizza challenge and shows how to structure the solution in a class diagram.
(funky upbeat music) … - Here's our solution for creating pizzas … with the decorator pattern. … In this solution, we've closely followed … the decorator pattern structure. … First, we define a Pizza class that has … a getDescription method and an abstract cost method. … Then we added ThinCrustPizza and ThickCrustPizza … concrete subclasses, which both extend the Pizza class. … We also created a ToppingDecorator class … that, again, following the structure … of the decorator pattern, extends the Pizza abstract class. … Note that ToppingDecorator has a property Pizza … and an abstract method getDescription. … Extending the ToppingDecorator, … we've created classes Cheese, Olives, … and Peppers for our toppings. … We'll pass in the pizza the toppings are decorating … and the constructor, and store the pizza in the Pizza … variable that's inherited from the ToppingDecorator class. … The cost method in the pizza classes return … the cost of the basic thin or thick crust pizza, … while the cost method in the toppings classes …
- 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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