Courseiva
Question 379 of 481
Object-Oriented ProgrammingmediumMultiple ChoiceObjective-mapped

1Z0-811 Object-Oriented Programming Practice Question

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?

⚠ Common exam trap

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.

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

Car moves

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'.

Answer analysis

Option-by-option breakdown

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.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Last reviewed: Jun 11, 2026

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

Sign in to join the discussion.

This 1Z0-811 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-811 exam.