Time to practice your new factory building skills with a challenge.
(futuristic electronic music) … - [Instructor] Take a look at this design. … We have a ZoneFactory whose job is to create … the right kind of time zone for our calendar app. … Let's say you're instantiating a calendar … for a user in the Pacific Time Zone. … Then you'd ask the ZoneFactory … to create the appropriate zone for the calendar to use. … The time zones the Factory knows how to create … are the U.S. time zones, … Eastern Time, Central Time, Mountain Time, … and Pacific Time, … and each has a corresponding zoneid. … The zone displayName is just the name of the time zone, … like USPacific, … and the offset is the numeric offset … of the time zone from GMT … which is minus five for Eastern, … minus six for Central, … minus seven for Mountain, … and minus eight for Pacific. … Your challenge is to write the code for the Zone classes, … that is the Zone class and its subclasses … and the ZoneFactory that will create the correct zone … based on the zone id that you pass … to its createZone method, …
- 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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