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How can interfaces be combined with abstract classes to design a flexible system?

hard📝 Application Q9 of 15
Java - Interfaces
How can interfaces be combined with abstract classes to design a flexible system?
AUse only interfaces without any classes
BReplace interfaces with abstract classes completely
CUse interfaces to define method contracts and abstract classes to provide partial implementation
DUse abstract classes only for method declarations
Step-by-Step Solution
Solution:

  1. Step 1: Understand roles of interfaces and abstract classes

    Interfaces define method contracts; abstract classes can provide shared code.

  2. Step 2: Combine for flexibility

    Implement interfaces for required methods; extend abstract classes for common behavior.

  3. Final Answer:

    Use interfaces to define method contracts and abstract classes to provide partial implementation -> Option C

  4. Quick Check:

    Interfaces + abstract classes = flexible design [OK]
Quick Trick: Combine interfaces and abstract classes for reuse [OK]
Common Mistakes:
  • Thinking interfaces replace abstract classes fully
  • Using only interfaces without shared code
  • Misusing abstract classes for declarations only

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