In the solution to the challenge, see you how to loosely couple weather data observers to the weather data source.
(energetic music) … - [Instructor] Here's our solution to the challenge. … We created a new subject interface … that the weather station implements, … and we added a list of observers to the weather station. … We created implementations of the methods required … by the subject interface to allow observers … to come and go and to notify observers … when the weather station's data changes. … We also added a new observer interface … with an update method … and had each of the classes interested … in the weather data implement that interface. … That means each class needs to implement the update method. … In addition, each class gets a reference … to the weather station to access the methods … in the weather station to add and remove themselves … whenever they want from the list of observers. … …
- 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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