Quick Answer
The answer is that Circle must override draw(). This is correct because when a concrete class extends an abstract class, it is required to implement all abstract methods inherited from that parent; here, Circle provides an empty body for draw(), which fulfills the abstract class method implementation requirement. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your understanding of inheritance and polymorphism, specifically that a non-abstract subclass cannot leave any abstract method unimplemented—a common trap is thinking an empty body doesn't count as an override, but it does. Remember the rule: if a class is not abstract, it must complete every abstract method it inherits, or the code will not compile. A helpful memory tip is to think of abstract methods as contracts: a concrete subclass must sign every dotted line.
This 1Z0-811 practice question tests your understanding of object-oriented programming. 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.
Given: abstract class Shape { abstract void draw(); } class Circle extends Shape { void draw() {} } Which is true?
Shape cannot have a constructor
Why wrong: Abstract classes can have constructors, invoked via super().
Circle must override draw()
Circle provides implementation; it compiles fine.
Shape s = new Shape(); is valid
Why wrong: Cannot instantiate abstract classes.
draw() must be public in Circle
Why wrong: The overriding method can have the same or broader access; not necessarily public.
Answer choices
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()
Option B is correct because 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.
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.
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.
Related concept
Read the scenario before looking for a memorised answer.
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.
Common exam traps
The trap here is that candidates often 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.
Detailed technical explanation
In Java, an abstract class is a class declared with the abstract keyword that may contain abstract methods (methods without a body). When a concrete class extends an abstract class, the compiler enforces that all abstract methods are implemented; failure to do so results in a compilation error. The access modifier of the overriding method must be the same or more permissive (e.g., default can be overridden by default, protected, or public), but not more restrictive. This design allows abstract classes to define a contract for subclasses while still providing shared implementation via constructors and concrete methods.
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.
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FAQ
Object-Oriented Programming — This question tests Object-Oriented Programming — Read the scenario before looking for a memorised answer..
The correct answer is: Circle must override draw() — Option B is correct because 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.
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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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A developer creates an interface 'Drawable' with a single abstract method 'draw()'. They then create a class 'Circle' that implements Drawable but forgets to provide the draw() method. Circle is not declared abstract. What will happen when compiling Circle?
hardWhy C: A class that implements an interface must provide implementations for all abstract methods, or it must be declared abstract. Without the implementation and without being abstract, the class does not compile.
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Last reviewed: Jun 11, 2026
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