- A
Code reuse
Subclasses reuse superclass code.
- B
Improved security
Why wrong: Encapsulation improves security, not inheritance.
- C
Enables polymorphism
Polymorphism works with inheritance.
- D
Establishes an is-a relationship
Subclass is a superclass.
- E
Reduces memory usage
Why wrong: Inheritance does not directly reduce memory.
Question 65 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.
Which THREE are benefits of using inheritance?
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
✓
Code reuse
Option A is correct because inheritance allows a subclass to reuse fields and methods from a superclass without rewriting them. This directly reduces code duplication and promotes maintainability in Java.
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.
- ✓
Code reuse
Why this is correct
Subclasses reuse superclass code.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Improved security
Why it's wrong here
Encapsulation improves security, not inheritance.
- ✓
Enables polymorphism
Why this is correct
Polymorphism works with inheritance.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Establishes an is-a relationship
Why this is correct
Subclass is a superclass.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Reduces memory usage
Why it's wrong here
Inheritance does not directly reduce memory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the misconception that inheritance improves security or reduces memory usage, when in fact it primarily enables code reuse, polymorphism, and the is-a relationship.
Detailed technical explanation
How to think about this question
In Java, inheritance is implemented via the `extends` keyword, and the subclass inherits all accessible members (public, protected, default) from the superclass. Polymorphism is enabled because a subclass object can be referenced by a superclass type, allowing method overriding and dynamic dispatch at runtime. The 'is-a' relationship is a fundamental design principle: a subclass is a specialized version of its superclass, ensuring logical hierarchy.
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.
TExam Day Tips
- 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.
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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: Code reuse — Option A is correct because inheritance allows a subclass to reuse fields and methods from a superclass without rewriting them. This directly reduces code duplication and promotes maintainability in Java.
What should I do if I get this 1Z0-811 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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