This 1Z0-811 practice question tests your understanding of object-oriented programming. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer writes a class 'Vehicle' with a method 'move()' that prints 'Vehicle moves'. A subclass 'Car' overrides 'move()' to print 'Car moves'. Given: Vehicle v = new Car(); v.move(); What is the output?
Vehicle moves
Why wrong: Static binding would give this, but method overriding uses dynamic binding.
Runtime exception
Why wrong: No exception; method invocation is valid.
Compilation fails
Why wrong: The code compiles fine; Car is a subclass of Vehicle.
Car moves
Correct due to polymorphism; the overridden method in Car is called.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Car moves
Option D is correct because Java uses dynamic method dispatch (runtime polymorphism). Even though the reference variable is of type 'Vehicle', the actual object is a 'Car' instance. At runtime, the JVM calls the overridden 'move()' method of the 'Car' class, printing 'Car moves'.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Vehicle moves
Why it's wrong here
Static binding would give this, but method overriding uses dynamic binding.
Runtime exception
Why it's wrong here
No exception; method invocation is valid.
Compilation fails
Why it's wrong here
The code compiles fine; Car is a subclass of Vehicle.
Car moves
Why this is correct
Correct due to polymorphism; the overridden method in Car is called.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates mistakenly apply static binding (thinking the compiler uses the reference type 'Vehicle' to call 'move()'), ignoring Java's runtime polymorphism for overridden instance methods.
Detailed technical explanation
Under the hood, the JVM uses a virtual method table (vtable) for each class. When 'v.move()' is invoked, the JVM looks up the method entry in the vtable of the actual object's class ('Car'), not the reference type ('Vehicle'). This enables polymorphic behavior, which is fundamental for designing extensible frameworks like Java's Collections API, where a 'List' reference can hold a 'LinkedList' or 'ArrayList' and call the appropriate 'add()' implementation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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FAQ
Object-Oriented Programming — This question tests Object-Oriented Programming — Read the scenario before looking for a memorised answer..
The correct answer is: Car moves — Option D is correct because Java uses dynamic method dispatch (runtime polymorphism). Even though the reference variable is of type 'Vehicle', the actual object is a 'Car' instance. At runtime, the JVM calls the overridden 'move()' method of the 'Car' class, printing 'Car moves'.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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