Quick Answer
The answer is that a final class cannot be extended, a final method cannot be overridden, and a final variable can only be assigned once. These three restrictions form the core of the Java final keyword, which is used to enforce immutability and prevent unwanted modification in your code. On the Oracle Java Foundations 1Z0-811 exam, you will often see a question asking you to identify which statements about final are true, with common traps including the idea that a final variable must be initialized at declaration (it can be left blank if assigned in a constructor) or that a final class can still be instantiated (it can, just not subclassed). The exam tests your understanding of how final applies differently to variables, methods, and classes, so remember that final on a variable locks its value, final on a method locks its implementation, and final on a class locks its inheritance. A helpful memory tip: think of the word "final" as a "lock" — once locked, no changes allowed, no overrides, and no children.
This 1Z0-811 practice question tests your understanding of java basics and syntax. 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.
Which THREE statements about the final keyword in Java are true?
A final variable cannot be reassigned after initialization.
Correct.
A final reference variable cannot be made to refer to a different object.
Correct.
A final method can be overridden in a subclass.
Why wrong: Final methods cannot be overridden.
A final parameter in a method allows the method to modify the argument value.
Why wrong: Final parameter cannot be changed; it is a local constant.
A final class cannot be extended.
Correct.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A final variable cannot be reassigned after initialization.
Option A is correct because a final variable in Java can only be assigned once. After initialization, any attempt to reassign the variable results in a compile-time error. This ensures the variable's value remains constant throughout its scope.
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.
A final variable cannot be reassigned after initialization.
Why this is correct
Correct.
Related concept
Read the scenario before looking for a memorised answer.
A final reference variable cannot be made to refer to a different object.
Why this is correct
Correct.
Related concept
Read the scenario before looking for a memorised answer.
A final method can be overridden in a subclass.
Why it's wrong here
Final methods cannot be overridden.
A final parameter in a method allows the method to modify the argument value.
Why it's wrong here
Final parameter cannot be changed; it is a local constant.
A final class cannot be extended.
Why this is correct
Correct.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Oracle often tests the distinction between a final reference variable and the immutability of the object it refers to, leading candidates to incorrectly assume that a final reference prevents all changes to the object's state.
Detailed technical explanation
Under the hood, the final keyword for variables ensures that the JVM can perform optimizations such as inlining constants and safe publication in multithreaded contexts. For reference variables, final means the reference cannot point to a different object, but the object's internal state can still be modified unless it is immutable. This distinction is critical in designing thread-safe classes and enforcing immutability contracts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
The correct answer is: A final variable cannot be reassigned after initialization. — Option A is correct because a final variable in Java can only be assigned once. After initialization, any attempt to reassign the variable results in a compile-time error. This ensures the variable's value remains constant throughout its scope.
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 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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