- A
The method is a constructor.
Why wrong: Constructors have no return type and name matches class name.
- B
The method will cause a compilation error.
Why wrong: Code compiles successfully.
- C
The method sets the instance variable age.
Uses 'this.age' to refer to instance variable.
- D
The method is static.
Why wrong: No static modifier present.
Question 8 of 509
1Z0-811 Java Basics and Syntax Practice Question
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.
A method is declared as:
public void setAge(int age) { this.age = age; }Which statement is correct about this code assuming the class has an instance variable age?
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
✓
The method sets the instance variable age.
Option C is correct because the method `setAge(int age)` uses the `this` keyword to assign the parameter value to the instance variable `age`, which is a standard setter pattern in Java. The method has a `void` return type and is not a constructor, and it compiles successfully because the instance variable `age` is assumed to exist in the class.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The method is a constructor.
Why it's wrong here
Constructors have no return type and name matches class name.
- ✗
The method will cause a compilation error.
Why it's wrong here
Code compiles successfully.
- ✓
The method sets the instance variable age.
Why this is correct
Uses 'this.age' to refer to instance variable.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The method is static.
Why it's wrong here
No static modifier present.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between constructors and regular methods by including a `void` return type, which immediately disqualifies a method from being a constructor, even if it looks like one due to parameter assignment.
Detailed technical explanation
How to think about this question
The `this` keyword is a reference to the current object, used here to resolve naming conflict between the parameter `age` and the instance variable `age`. Under the hood, the Java compiler generates bytecode that stores the parameter value into the field offset of the object. In real-world scenarios, this setter pattern is fundamental for encapsulation, allowing controlled access to private fields, and is often used with JavaBeans conventions for frameworks like Spring or Hibernate.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 1Z0-811 question test?
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The method sets the instance variable age. — Option C is correct because the method `setAge(int age)` uses the `this` keyword to assign the parameter value to the instance variable `age`, which is a standard setter pattern in Java. The method has a `void` return type and is not a constructor, and it compiles successfully because the instance variable `age` is assumed to exist in the class.
What should I do if I get this 1Z0-811 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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