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 developer wants to create a stream that repeatedly generates random integers. Which method should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IntStream.generate(() -> new Random().nextInt())
Option C is correct because `IntStream.generate()` accepts a `Supplier<Integer>` and produces an infinite sequential unordered stream, making it ideal for repeatedly generating random integers. The lambda `() -> new Random().nextInt()` supplies a new random integer each time the stream is evaluated, fulfilling the requirement exactly.
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.
✗
IntStream.range(0, 100)
Why it's wrong here
This creates a finite integer stream from 0 to 99 without randomness.
✗
Stream.of(new Random().nextInt())
Why it's wrong here
This creates a single-element stream, not infinite.
✓
IntStream.generate(() -> new Random().nextInt())
Why this is correct
This creates an infinite stream of random ints; it's the idiomatic choice for primitive streams.
Related concept
Read the scenario before looking for a memorised answer.
✗
Stream.iterate(0, i -> new Random().nextInt())
Why it's wrong here
This creates an infinite stream starting with 0 and then random numbers, but it's not purely random and uses an initial seed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `Stream.generate()` with `Stream.iterate()` or `Stream.of()`, mistakenly thinking that a single random call or a finite range can produce an infinite stream of random values, when only `generate()` with a `Supplier` correctly models repeated independent generation.
Detailed technical explanation
How to think about this question
`IntStream.generate()` uses a `Supplier` that is invoked lazily for each element, meaning the stream is truly infinite and can be limited via `limit()` or short-circuiting operations. Under the hood, `Random.nextInt()` uses a linear congruential generator (LCG) algorithm, which is deterministic but statistically random for most use cases. In real-world scenarios, this pattern is commonly used for Monte Carlo simulations or load testing where an unbounded stream of random data is needed, and developers must be careful to avoid infinite consumption without a terminal operation like `findFirst()` or `limit()`.
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 1Z0-829 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: IntStream.generate(() -> new Random().nextInt()) — Option C is correct because `IntStream.generate()` accepts a `Supplier<Integer>` and produces an infinite sequential unordered stream, making it ideal for repeatedly generating random integers. The lambda `() -> new Random().nextInt()` supplies a new random integer each time the stream is evaluated, fulfilling the requirement exactly.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 1Z0-829 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-829 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.