The answer is that the implementation method must be declared public. This is because interface methods are implicitly public and abstract in Java, so when a concrete class like Circle implements the Drawable interface, it must provide a method with the same or greater visibility—and since the interface method is already public, the implementing method cannot be reduced to package-private or protected. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your understanding of access modifiers and the contract between interfaces and implementing classes; a common trap is forgetting that omitting the public modifier in the implementing class causes a compilation error, or mistakenly thinking the class can remain non-abstract without providing the method. To remember this, think of the mnemonic “Interface methods are born public—implementations must stay public.”
1Z0-811 Object-Oriented Programming Practice Question
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.
Consider the following interface: public interface Drawable { void draw(); } A developer implements Drawable in class Circle. Which statement about the implementation is correct?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Both A and D
Interface methods are implicitly public, so implementing class must use public; if not implementing, class must be abstract.
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 draw method must be declared public
Why it's wrong here
Correct, because interface methods are implicitly public, so implementing class must use public.
✓
Both A and D
Why this is correct
Both A and D are correct. Interface methods are implicitly public, so implementing class must use public. If not implementing, class must be abstract.
Related concept
Read the scenario before looking for a memorised answer.
✗
The class must be abstract if it does not provide body for draw
Why it's wrong here
Correct; if Circle does not implement draw, it must be declared abstract.
✗
The draw method can have a body in the interface
Why it's wrong here
Incorrect; in this interface method is abstract without body. Java 8+ can have default methods, but here it's not.
✗
The draw method must be declared final
Why it's wrong here
Incorrect; final is not required.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which 1Z0-811 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Object-Oriented Programming — This question tests Object-Oriented Programming — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Both A and D — Interface methods are implicitly public, so implementing class must use public; if not implementing, class must be abstract.
What should I do if I get this 1Z0-811 question wrong?
Identify which 1Z0-811 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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