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1Z0-811 Java Basics and Syntax Practice Question

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?

⚠ Common exam trap

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.

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.

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.

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.
✗
The method is static.
Why it's wrong here
No static modifier present.

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1Z0-811 Java Basics and Syntax Practice Question

Why each option matters

Option-by-option breakdown

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