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Holub on Patterns
Remove extends
charsyam@naver.com
Why Removes
Extends?
Extends is not Bad.
Just. Using Concrete Class
is Bad
Use Interface!
How to Remove Extens?
Use Abstract Factory!
Using 1
Employee<<interface>> EmployeeFactory
<<Employee>>+create()
Peon
<<void>>+youAreFired()
Factory
Using 2
Using 3
Use Abstract Factory!
2 Patterns Singleton
Abstract Factory
Pass Singleton Pattern
Don’t Use Double-Checked Locking
Threading Issue
Abstract Factory Pattern
Factory is changable
NOT Factory Method Pattern
Abstract Factory Pattern
Abstraction 1 Employee.Factory.create();
Abstraction 2
Employee.create();
Employee.Factory.create();
Java Example
HttpURLConnection
FtpURLConnection
2 Patterns Command Strategy
Pass Command Pattern Default Pattern
Strategy Example
Thank You!
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