Question 312 of 481
1Z0-811 Object-Oriented Programming Practice Question
Which THREE are true about Java constructors?
⚠ Common exam trap
A common mix-up: candidates confuse constructors with regular methods and think that final or abstract modifiers apply, but Java explicitly forbids these on constructors because they are not inherited or overridden.
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
✓
A constructor cannot have a return type
Constructors in Java do not have a return type, not even void. If you attempt to add a return type to a constructor, the compiler treats it as a regular method, not a constructor, which can lead to unexpected behavior. This is a fundamental rule of Java syntax.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A constructor cannot have a return type
Why this is correct
A constructor in Java is a special method that initialises an object, and the language specification explicitly prohibits any return type declaration, including `void`, because the constructor’s sole purpose is to allocate and initialise the instance, not to return a value. This satisfies the stem’s constraint that a constructor cannot have a return type, distinguishing it from regular methods which must declare one.
- ✗
A constructor can be marked final
Why it's wrong here
Constructors cannot be final.
- ✗
A constructor can be abstract
Why it's wrong here
Constructors cannot be abstract.
- ✓
A constructor can be overloaded
Why this is correct
Constructors can be overloaded with different parameters.
- ✓
A constructor can be private
Why this is correct
A private constructor is used in singleton pattern.
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Last reviewed: Jun 25, 2026
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