In this video, test the skills learned so far by applying the strategy pattern to a design.
(energetic music) … - [Instructor] Take a look at the class diagram … on this slide. … We have an abstract class, PhoneCameraApp, … with four methods: … take, edit, save and share. … And, we have two concrete classes … that extend PhoneCameraApp. … BasicCameraApp, and CameraPlusApp. … The edit method in the superclass is abstract, … because each camera app … will provide its own specialized editor, … but the rest of the methods … can be inherited by the subclasses. … We get a lot of code reuse, … because the taking, saving and sharing … are the same across many apps. … That way, the apps can implement custom editors … that get the other functionality for free … from the superclass. … The share method in the superclass … lets the user pick how they want to share the photo, … and then uses that algorithm to share. … Right now, the share method allows the user … to share photos by text and by email. … We're running into a problem, however. … We keep having to open up the PhoneCameraApp class …
- 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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