SOLID Design Principles: Interface Segregation Design Principle

INTERFACE SEGREGATION PRINCIPLE (ISP)
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The Interface Segregation Principle (ISP) states that a class should not be forced
to implement methods it doesn’t need.
In other words, a class should have small, focused interfaces
rather than large, monolithic ones.
Interface Device
- printDocument
- scanDocument
- faxDocument
Printer implemented Device (BAD DESIGN)
- printDocument
- scanDocument
- faxDocument