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Which of the following is a common misconception about method overriding's impact on program performance?

medium🪤 Complexity Trap Q6 of Q15
OOP & Design Patterns - Polymorphism - Compile-Time (Overloading) vs Runtime (Overriding)
Which of the following is a common misconception about method overriding's impact on program performance?
AOverriding introduces runtime overhead due to dynamic dispatch via vtables.
BOverriding methods always execute faster than overloaded methods.
COverriding can prevent inlining optimizations by the compiler.
DOverriding enables polymorphic behavior without affecting compile-time type checking.
Step-by-Step Solution
Solution:

  1. Step 1: Understand overriding performance characteristics

    Overriding uses dynamic dispatch, which can introduce slight runtime overhead compared to static calls.

  2. Step 2: Analyze options

    A is true; dynamic dispatch uses vtables causing some overhead. B is false; overridden methods are generally slower than overloaded methods due to runtime dispatch. C is true; overriding can inhibit inlining. D is true; overriding preserves compile-time type checking while enabling runtime polymorphism.

  3. Final Answer:

    Overriding methods always execute faster than overloaded methods -> Option B

  4. Quick Check:

    Overridden methods usually slower than overloaded ones [OK]
Quick Trick: Overriding adds runtime dispatch overhead, not speed [OK]
Common Mistakes:
MISTAKES
  • Assuming overriding is always faster
  • Ignoring dynamic dispatch cost
  • Believing overriding breaks compile-time checks
Trap Explanation:
PITFALL
  • Candidates often incorrectly believe overriding improves speed over overloading.
Interviewer Note:
CONTEXT
  • Tests nuanced understanding of runtime costs of polymorphism.
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