- A
final double PI = 3.14159;
Why wrong: Incorrect. This declaration uses `final` and uppercase `PI`, which follows naming conventions, but it lacks `public` and `static`. Without `public`, the constant is not accessible from outside the class; without `static`, it is an instance variable, not a class constant. This does not follow best practices.
- B
double pi = 3.14159;
Why wrong: Incorrect. This lacks the `final` keyword, so the variable `pi` can be reassigned, making it not a constant.
- C
public static final double pi = 3.14159;
Correct. This uses `public static final`, which are the modifiers required for a class-level constant according to Java best practices. Although the name `pi` is lowercase (violating naming conventions), the presence of `public static final` is the key aspect of a proper constant declaration.
- D
final double pi = 3.14159;
Why wrong: Incorrect. This uses `final` but the name is lowercase and it lacks `public` and `static`. The modifiers are incomplete for a best-practice constant declaration.
1Z0-811 Constant Declaration Practice Question
This 1Z0-811 practice question tests your understanding of java basics and syntax. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. A key principle to apply: constant Declaration. 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 developer needs to declare a constant for the value of PI (3.14159) in a class. Which declaration follows Java best practices?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
public static final double pi = 3.14159;
Option C is the best choice because Java best practices for constants require the use of the `public static final` modifiers to create a class-level constant. While the naming convention recommends uppercase names (e.g., `PI`), the presence of `public static final` is more critical for a constant to be accessible and immutable across the class. Option A lacks `public` and `static`, making it an instance constant rather than a class constant, which does not follow best practices. Therefore, among the given choices, Option C is the most appropriate.
Key principle: Constant Declaration
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
final double PI = 3.14159;
Why it's wrong here
Incorrect. This declaration uses `final` and uppercase `PI`, which follows naming conventions, but it lacks `public` and `static`. Without `public`, the constant is not accessible from outside the class; without `static`, it is an instance variable, not a class constant. This does not follow best practices.
- ✗
double pi = 3.14159;
Why it's wrong here
Incorrect. This lacks the `final` keyword, so the variable `pi` can be reassigned, making it not a constant.
- ✓
public static final double pi = 3.14159;
Why this is correct
Correct. This uses `public static final`, which are the modifiers required for a class-level constant according to Java best practices. Although the name `pi` is lowercase (violating naming conventions), the presence of `public static final` is the key aspect of a proper constant declaration.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Constant Declaration
- ✗
final double pi = 3.14159;
Why it's wrong here
Incorrect. This uses `final` but the name is lowercase and it lacks `public` and `static`. The modifiers are incomplete for a best-practice constant declaration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common trap is to focus only on the `final` keyword or the naming convention, overlooking that constants should be declared `public static final` to be class-level and accessible. Candidates may choose Option A because it uses uppercase `PI`, but miss the requirement for `static` and `public`. Option C correctly includes these modifiers, even though its name is lowercase, making it the better answer.
Trap categories for this question
Keyword trap
Incorrect. This lacks the `final` keyword, so the variable `pi` can be reassigned, making it not a constant.
Detailed technical explanation
How to think about this question
In Java, a constant is typically declared with `public static final` to make it a class-level constant accessible without an instance, but the `final` keyword alone is sufficient to make it a compile-time constant if the value is a literal. The Java Language Specification (JLS) defines compile-time constants as `final` variables of primitive types or `String` initialized with constant expressions, which allows the compiler to inline the value for performance. In real-world scenarios, using `Math.PI` is preferred over declaring your own PI constant, but when a custom constant is needed, following the uppercase naming convention is critical for maintainability.
KKey Concepts to Remember
- Constant Declaration
- public static final
- Naming Conventions
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
Constant Declaration
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. Constant Declaration 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?
Java Basics and Syntax — This question tests Java Basics and Syntax — Constant Declaration.
What is the correct answer to this question?
The correct answer is: public static final double pi = 3.14159; — Option C is the best choice because Java best practices for constants require the use of the `public static final` modifiers to create a class-level constant. While the naming convention recommends uppercase names (e.g., `PI`), the presence of `public static final` is more critical for a constant to be accessible and immutable across the class. Option A lacks `public` and `static`, making it an instance constant rather than a class constant, which does not follow best practices. Therefore, among the given choices, Option C is the most appropriate.
What should I do if I get this 1Z0-811 question wrong?
Review constant Declaration, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Constant Declaration
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Last reviewed: Jun 30, 2026
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