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Which scenario best illustrates the need to apply the Interface Segregation Principle (ISP) in a software design?

easy🔍 Pattern Recognition Q1 of Q15
OOP & Design Patterns - Interface Segregation & Dependency Inversion - Fat Interfaces & IoC
Which scenario best illustrates the need to apply the Interface Segregation Principle (ISP) in a software design?
AMultiple small interfaces are combined into one large interface to reduce the number of dependencies.
BA class depends on abstractions rather than concrete implementations.
CA single interface with many unrelated methods forces clients to implement unused methods.
DAn IoC container is used to inject dependencies at runtime.
Step-by-Step Solution
Solution:

  1. Step 1: Identify the ISP violation scenario

    ISP violation occurs when clients are forced to depend on interfaces they do not use, typically due to fat interfaces with many unrelated methods.

  2. Step 2: Analyze options

    A single interface with many unrelated methods forces clients to implement unused methods, which is the classic ISP violation. Combining multiple small interfaces into one large interface is the opposite of ISP. Depending on abstractions relates to DIP, not ISP. Using an IoC container relates to dependency injection, not ISP.

  3. Final Answer:

    Option C -> Option C

  4. Quick Check:

    Fat interfaces forcing unused methods -> ISP needed [OK]
Quick Trick: ISP fixes fat interfaces forcing unused methods [OK]
Common Mistakes:
MISTAKES
  • Confusing DIP with ISP
  • Thinking IoC is related to ISP
  • Believing combining interfaces is ISP
Trap Explanation:
PITFALL
  • Candidates often confuse ISP with DIP or IoC concepts, or think combining interfaces reduces complexity, which is opposite to ISP.
Interviewer Note:
CONTEXT
  • Reveals candidate's understanding of when ISP applies in design.
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