- A
Abstraction
Why wrong: Abstraction focuses on hiding implementation details, not data hiding.
- B
Inheritance
Why wrong: No parent-child class relationship is present.
- C
Polymorphism
Why wrong: No method overriding or dynamic dispatch is involved.
- D
Encapsulation
Encapsulation bundles data with methods and restricts direct access to fields.
Question 443 of 509
Encapsulation in Java: Banking Example
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. A key principle to apply: encapsulation. 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.
In a banking application, a class 'Account' has private field 'balance' and public methods 'getBalance()' and 'setBalance(double)'. This is an example of which OOP principle?
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
✓
Encapsulation
Option D is correct because encapsulation hides internal data (the 'balance' field) and provides controlled access via public methods 'getBalance()' and 'setBalance(double)'. Option A is wrong because abstraction focuses on hiding implementation complexity rather than data protection; the example demonstrates data hiding which is encapsulation. Option B is wrong because inheritance involves a parent-child class relationship, which is not shown. Option C is wrong because polymorphism requires method overriding or overloading, which is not present here.
Key principle: Encapsulation
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Abstraction
Why it's wrong here
Abstraction focuses on hiding implementation details, not data hiding.
- ✗
Inheritance
Why it's wrong here
No parent-child class relationship is present.
- ✗
Polymorphism
Why it's wrong here
No method overriding or dynamic dispatch is involved.
- ✓
Encapsulation
Why this is correct
Encapsulation bundles data with methods and restricts direct access to fields.
Related concept
Encapsulation
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
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Encapsulation
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
Encapsulation
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. Encapsulation 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.
Review encapsulation, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
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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 — Encapsulation.
What is the correct answer to this question?
The correct answer is: Encapsulation — Option D is correct because encapsulation hides internal data (the 'balance' field) and provides controlled access via public methods 'getBalance()' and 'setBalance(double)'. Option A is wrong because abstraction focuses on hiding implementation complexity rather than data protection; the example demonstrates data hiding which is encapsulation. Option B is wrong because inheritance involves a parent-child class relationship, which is not shown. Option C is wrong because polymorphism requires method overriding or overloading, which is not present here.
What should I do if I get this 1Z0-811 question wrong?
Review encapsulation, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Encapsulation
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Last reviewed: Jun 23, 2026
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