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How does abstraction combined with polymorphism improve code flexibility in Java?

hard📝 Application Q9 of 15
Java - Abstraction
How does abstraction combined with polymorphism improve code flexibility in Java?
ABy forcing all methods to be static and final
BBy allowing code to use abstract references to call overridden methods of different subclasses at runtime
CBy preventing method overriding in subclasses
DBy requiring all classes to be abstract
Step-by-Step Solution
Solution:

  1. Step 1: Understand abstraction and polymorphism

    Abstraction defines common methods; polymorphism allows calling subclass methods via abstract references.

  2. Step 2: Analyze code flexibility

    This lets code work with different subclass objects interchangeably, improving flexibility and extensibility.

  3. Final Answer:

    By allowing code to use abstract references to call overridden methods of different subclasses at runtime -> Option B

  4. Quick Check:

    Abstraction + polymorphism = flexible method calls [OK]
Quick Trick: Abstract references call subclass methods dynamically [OK]
Common Mistakes:
  • Thinking methods must be static
  • Believing overriding is disallowed
  • Assuming all classes must be abstract

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