Return to some limitations of inheritance and create a class explosion in this video.
- We're now going to explore a pattern called … the decorator pattern, and to get a better … understanding for this pattern we're going to start … with a small example. … Let's say you want to build an order system … for a small coffee shop, one which serves … and takes payments for beverages. … The shop has four main types of beverages … on the menu, each of which has a description and a cost. … And to each beverage you can add a number … of condiments like soy or milk or whip or mocha. … Each of these condiments has a small cost … which needs to be added to the cost of the coffee. … Let's sketch out a design for the coffee shop's … order system. … We'll start with a beverage superclass … which has a description field and a corresponding … getter method as well as a cost method. … Now let's add some subclasses like house blend, … dark roast, decaf, and espresso. … Note that each coffee is a beverage. … In other words, we have an is-a relationship … between the coffees and the beverage superclass. …
- 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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