Question 276 of 481
1Z0-811 Object-Oriented Programming Practice Question
A developer wants to ensure that a class cannot be subclassed. Which keyword should be used?
⚠ Common exam trap
Oracle often tests the `final` keyword in the context of inheritance, and the trap here is that candidates confuse `final` with `abstract` (which forces subclassing) or `private` (which is about access, not inheritance prevention), leading them to pick the wrong option.
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
✓
final
The `final` keyword prevents a class from being subclassed. When a class is declared `final`, the compiler enforces that no other class can extend it, ensuring its implementation cannot be overridden or inherited. This is the correct mechanism in Java to prevent subclassing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
final
Why this is correct
A class declared as final cannot be subclassed.
- ✗
protected
Why it's wrong here
Protected access allows subclass access, but does not prevent subclassing.
- ✗
private
Why it's wrong here
The private access modifier controls visibility within a class, not inheritance.
- ✗
abstract
Why it's wrong here
An abstract class is intended to be subclassed; it cannot be instantiated directly.
- ✗
static
Why it's wrong here
The static keyword is used for class-level variables and methods, not to prevent inheritance.
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Same concept, more angles
1 more way this is tested on 1Z0-811
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security-sensitive class should not be extended by any other class. Which modifier should be applied to the class declaration?
easy- ✓ A.final
- B.abstract
- C.static
- D.private
Why A: The final modifier prevents a class from being subclassed, which is appropriate for security or design reasons.
Last reviewed: Jun 30, 2026
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.
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