The answer is BiPredicate<Integer, Integer>. This is correct because the BiPredicate functional interface is specifically designed to accept two input arguments and return a boolean value, making it the ideal match for a lambda expression that compares two integers and returns a boolean result. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, questions often test your ability to distinguish between similar functional interfaces like Predicate (single argument), BiPredicate (two arguments), and Function or BiFunction (which return non-boolean types). A common trap is confusing BiPredicate with BiFunction, but remember that any interface ending in “Predicate” always returns a boolean, while “Function” returns a generic type. For quick recall, think of the “Bi” prefix as meaning “two inputs” and “Predicate” as “returns a boolean”—so BiPredicate is simply a two-argument boolean test.
1Z0-829 Working with Streams and Lambda Expressions Practice Question
This 1Z0-829 practice question tests your understanding of working with streams and lambda expressions. 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 lambda expression that takes two integers and returns a boolean indicating whether the first is greater than the second is best represented by which functional interface?
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.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
BiPredicate<Integer, Integer>
BiPredicate is designed for two arguments and returns a boolean. Option B correctly identifies this.
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.
✗
BiFunction<Integer, Integer, Boolean>
Why it's wrong here
BiFunction works but is less specific than BiPredicate for boolean returns.
✗
Predicate<Integer>
Why it's wrong here
Predicate takes only one argument.
✗
BinaryOperator<Boolean>
Why it's wrong here
BinaryOperator takes two arguments of the same type and returns a value of that type, not boolean.
✓
BiPredicate<Integer, Integer>
Why this is correct
Correct. BiPredicate<Integer, Integer> is the functional interface for two input arguments returning a boolean.
Clue confirmation
The clue words "best", "first" 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
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
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 1Z0-829 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 1Z0-829 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Working with Streams and Lambda Expressions — This question tests Working with Streams and Lambda Expressions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: BiPredicate<Integer, Integer> — BiPredicate is designed for two arguments and returns a boolean. Option B correctly identifies this.
What should I do if I get this 1Z0-829 question wrong?
Identify which 1Z0-829 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best", "first". 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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