1Z0-811 Object-Oriented Programming Practice Question
Given: abstract class Shape { abstract void draw(); } class Circle extends Shape { void draw() {} } Which is true?
⚠ Common exam trap
It's easy for candidates to think abstract classes cannot have constructors (option A) or that overriding methods must always be public (option D), but the Java specification allows constructors in abstract classes and only requires the overriding method to have at least the same access level as the abstract method.
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
✓
Circle must override draw()
Circle is a concrete class that extends the abstract class Shape, which declares the abstract method draw(). A concrete subclass of an abstract class must provide an implementation for all inherited abstract methods, unless the subclass is also declared abstract. Circle provides an implementation of draw() with an empty body, which satisfies the override requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Shape cannot have a constructor
Why it's wrong here
Abstract classes can have constructors, invoked via super().
- ✓
Circle must override draw()
Why this is correct
Circle provides implementation; it compiles fine.
- ✗
Shape s = new Shape(); is valid
Why it's wrong here
Cannot instantiate abstract classes.
- ✗
draw() must be public in Circle
Why it's wrong here
The overriding method can have the same or broader access; not necessarily public.
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