Question 467 of 481
1Z0-811 Object-Oriented Programming Practice Question
A developer writes a class 'Animal' with a method 'sound()'. The 'Cat' subclass overrides 'sound()'. If an Animal reference points to a Cat object, which method is called when sound() is invoked?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cat's sound()
Polymorphism ensures that the overridden method in the actual object's class is called at runtime, even if the reference is of the superclass type.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Runtime error
Why it's wrong here
No runtime error; the method call works as expected.
- ✓
Cat's sound()
Why this is correct
Correct. Java uses dynamic method dispatch for instance methods.
- ✗
Animal's sound()
Why it's wrong here
Polymorphism calls the subclass's overridden method.
- ✗
Compilation error
Why it's wrong here
No compilation error; this is valid Java code.
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Last reviewed: Jun 23, 2026
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