The correct choice is the method declared as public boolean isEven(int num) { return num % 2 == 0; } because it strictly follows Java boolean method naming conventions, which dictate that methods returning a boolean should begin with a verb like "is" or "has" to clearly indicate a true/false query. This implementation directly returns the boolean result of the expression num % 2 == 0, leveraging the remainder operator to check evenness without unnecessary if-else branching. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of both naming conventions and the efficient use of boolean expressions—a common trap is writing an if statement that returns true or false instead of returning the condition itself. Remember the memory tip: for boolean methods, always ask yourself "Is it true?" and let the method name answer with "is" or "has" for clarity.
1Z0-811 Java Basics and Syntax Practice Question
This 1Z0-811 practice question tests your understanding of java basics and syntax. 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.
A company requires a method that accepts an integer and returns true if the integer is even, otherwise false. Which implementation best follows Java conventions?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
public boolean isEven(int num) { return num % 2 == 0; }
Option D is correct because it defines a method with the appropriate return type `boolean`, uses a clear and conventional name `isEven`, and returns the result of the expression `num % 2 == 0` directly. This follows Java naming conventions (camelCase with a verb for boolean methods) and leverages the fact that `%` yields the remainder, which is compared to zero to produce a boolean result.
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.
✗
public void isEven(int num) { System.out.println(num%2==0); }
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between returning a value versus printing it, and the requirement that a method returning a boolean must have a `boolean` return type, not `int` or `void`; the trap here is that candidates may choose Option C because it 'works' syntactically, overlooking the conventional naming and unnecessarily verbose code.
Detailed technical explanation
How to think about this question
The modulo operator `%` in Java returns the remainder of integer division; for any integer `num`, `num % 2` yields `0` if even and `1` (or `-1` for negative numbers) if odd. The comparison `== 0` converts this integer result into a `boolean`, which is the correct return type. This pattern is idiomatic in Java and avoids unnecessary branching, improving readability and maintainability. In real-world code, such methods are often used in filtering streams or conditional logic where a boolean predicate is expected.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: public boolean isEven(int num) { return num % 2 == 0; } — Option D is correct because it defines a method with the appropriate return type `boolean`, uses a clear and conventional name `isEven`, and returns the result of the expression `num % 2 == 0` directly. This follows Java naming conventions (camelCase with a verb for boolean methods) and leverages the fact that `%` yields the remainder, which is compared to zero to produce a boolean result.
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.
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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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