This video walks you through the solution to the challenge and shows the instructor's implementation of the design.
(bright electronic music) … - [Instructor] Here's our challenge solution. … We created a Zone class with a String display name … and an integer offset. … We also implemented the two getter methods for those fields. … Each specific zone subclass extends zone … and sets the appropriate display name and offset … for each specific time zone. … And here's the Zone Factory class. … This factory has one method, create zone, … which takes the string zone ID. … We test the zone ID for each of the possible … zone classes we can create, … and create the appropriate concrete zone class … and return that. … The calendar will use the factory to create a zone, … and then use that zone class … to display the calendar appointments. … The calendar doesn't have to worry … about the specific type of the zone, … and if we want to add support for more time zones, … we can do that by updating the Zone Factory … without having to modify any calendar code. … …
- 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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