Quick Answer
The correct answer is `final double PI = 3.14159;` because it uses the `final` keyword to create a compile-time constant, ensuring the value cannot be reassigned, and follows Java naming conventions by using an uppercase identifier with underscores for word separation. This declaration is the minimal valid form of a Java constant, though in practice you often see `public static final` for class-level constants. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of the `final` modifier and naming conventions, with a common trap being that `const` is a reserved keyword in Java but not used for constants—only `final` works. Remember the memory tip: "Final and uppercase, never const in Java" to avoid confusing C++ or JavaScript habits with Java's approach.
This 1Z0-811 practice question tests your understanding of java basics and syntax. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 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.
final double PI = 3.14159;
Uses 'final' and uppercase name, following constant naming convention.
double pi = 3.14159;
Why wrong: Missing 'final' and naming convention.
public static final double pi = 3.14159;
Why wrong: Variable name should be uppercase even when public static final.
final double pi = 3.14159;
Why wrong: Correct use of 'final' but variable name should be uppercase per convention.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
final double PI = 3.14159;
Option A is correct because it declares a constant using the `final` keyword with a conventional uppercase name `PI`, which follows Java naming conventions for constants. The `final` modifier ensures the value cannot be reassigned, making it a compile-time constant. While `public static` is often added for class-level constants, the question does not require it, and `final double PI = 3.14159;` is a valid minimal declaration that adheres to best practices.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
final double PI = 3.14159;
Why this is correct
Uses 'final' and uppercase name, following constant naming convention.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
double pi = 3.14159;
Why it's wrong here
Missing 'final' and naming convention.
public static final double pi = 3.14159;
Why it's wrong here
Variable name should be uppercase even when public static final.
final double pi = 3.14159;
Why it's wrong here
Correct use of 'final' but variable name should be uppercase per convention.
Common exam traps
Oracle often tests the distinction between `final` (immutability) and naming conventions (uppercase for constants), so candidates may incorrectly choose Option D because it uses `final` but overlook the lowercase name, or Option C because it includes `public static` but uses a lowercase name.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
The correct answer is: final double PI = 3.14159; — Option A is correct because it declares a constant using the `final` keyword with a conventional uppercase name `PI`, which follows Java naming conventions for constants. The `final` modifier ensures the value cannot be reassigned, making it a compile-time constant. While `public static` is often added for class-level constants, the question does not require it, and `final double PI = 3.14159;` is a valid minimal declaration that adheres to best practices.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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