- A
Method Overloading
Why wrong: Overloading is compile-time and not suitable for runtime format selection.
- B
Composition
Composing Report with a formatter interface allows adding formats without modifying Report.
- C
Inheritance
Why wrong: Inheritance would require creating subclasses for each format, modifying Report if new formats are added.
- D
Singleton
Why wrong: Singleton controls instantiation but does not support extensibility.
Question 291 of 509
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.
A team is designing a system where a 'Report' class can be generated in different formats (PDF, Excel, HTML). They want to avoid modifying the Report class when adding new formats. Which OOP principle or pattern should they use?
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
✓
Composition
The correct answer is Composition (often implemented via the Strategy pattern), which allows the Report class to delegate format generation to separate strategy objects. This adheres to the Open/Closed Principle: the Report class is closed for modification but open for extension. Adding a new format only requires creating a new strategy class without altering the Report class. Option B (Composition) is correct. Option A (Method Overloading) is incorrect because it would require adding a new overloaded method for each format in the Report class, violating the goal of not modifying it. Option C (Inheritance) is incorrect because it would create a rigid hierarchy where each format is a subclass of Report, leading to tight coupling and difficulty in adding new formats without modifying existing code. Option D (Singleton) is incorrect because it ensures a single instance, which does not address the need for flexible format generation.
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.
- ✗
Method Overloading
Why it's wrong here
Overloading is compile-time and not suitable for runtime format selection.
- ✓
Composition
Why this is correct
Composing Report with a formatter interface allows adding formats without modifying Report.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Inheritance
Why it's wrong here
Inheritance would require creating subclasses for each format, modifying Report if new formats are added.
- ✗
Singleton
Why it's wrong here
Singleton controls instantiation but does not support extensibility.
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.
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FAQ
Questions learners often ask
What does this 1Z0-811 question test?
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: Composition — The correct answer is Composition (often implemented via the Strategy pattern), which allows the Report class to delegate format generation to separate strategy objects. This adheres to the Open/Closed Principle: the Report class is closed for modification but open for extension. Adding a new format only requires creating a new strategy class without altering the Report class. Option B (Composition) is correct. Option A (Method Overloading) is incorrect because it would require adding a new overloaded method for each format in the Report class, violating the goal of not modifying it. Option C (Inheritance) is incorrect because it would create a rigid hierarchy where each format is a subclass of Report, leading to tight coupling and difficulty in adding new formats without modifying existing code. Option D (Singleton) is incorrect because it ensures a single instance, which does not address the need for flexible format generation.
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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Last reviewed: Jun 23, 2026
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