课程: Programming Foundations: Design Patterns

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Challenge: The simple Factory pattern

Challenge: The simple Factory pattern

课程: Programming Foundations: Design Patterns

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Challenge: The simple Factory pattern

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(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…

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