1Z0-811 Object-Oriented Programming Practice Question
Which THREE are benefits of using inheritance?
⚠ Common exam trap
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.
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
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.
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.
- ✗
Improved security
Why it's wrong here
Encapsulation improves security, not inheritance.
- ✓
Enables polymorphism
Why this is correct
Polymorphism works with inheritance.
- ✓
Establishes an is-a relationship
Why this is correct
Subclass is a superclass.
- ✗
Reduces memory usage
Why it's wrong here
Inheritance does not directly reduce memory.
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Same concept, more angles
1 more way this is tested on 1Z0-811
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. Which TWO of the following are valid benefits of using inheritance in Java? (Choose two.)
medium- A.Increases coupling between classes
- ✓ B.Allows polymorphic behavior
- ✓ C.Promotes code reuse
- D.Enforces encapsulation
- E.Simplifies debugging
Why B: Options B and C are correct. Inheritance promotes code reuse by allowing subclasses to reuse fields and methods from superclasses, reducing redundancy. It also enables polymorphic behavior through method overriding, allowing objects to be treated as instances of their parent class. Option A is incorrect because inheritance actually increases coupling between classes, which is generally considered a disadvantage, not a benefit. Option D is incorrect because encapsulation is enforced through access modifiers (private, protected, public), not inheritance. Option E is incorrect because inheritance can actually complicate debugging by introducing dependencies across classes.
JA
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