Java Streams MCQs with answers Page - 2

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Q. Which method checks if any element matches the given predicate?

  • (A) allMatch()
  • (B) findAny()
  • (C) anyMatch()
  • (D) noneMatch()

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Q. Which method creates a stream from an array?

  • (A) Stream.ofArray()
  • (B) Arrays.stream()
  • (C) List.stream()
  • (D) ArrayList.stream()

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Q. Which method returns an Optional describing the first element?

  • (A) first()
  • (B) findFirst()
  • (C) getFirst()
  • (D) peek()

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Q. Which method skips the first n elements of the stream?

  • (A) skip()
  • (B) ignore()
  • (C) omit()
  • (D) pass()

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Q. Which stream operation is lazy?

  • (A) forEach()
  • (B) collect()
  • (C) map()
  • (D) count()

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Q. What is the output type of `Stream.map()`?

  • (A) List
  • (B) Stream
  • (C) Object[]
  • (D) Optional

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Q. Which Stream method is used for debugging purposes by peeking at elements?

  • (A) watch()
  • (B) debug()
  • (C) peek()
  • (D) observe()

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Q. What does `flatMap()` do in Java Streams?

  • (A) Flattens a stream of streams into a single stream
  • (B) Filters elements
  • (C) Sorts elements
  • (D) Creates nested lists

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Q. Which of the following statements is true about Streams?

  • (A) Streams modify the original collection
  • (B) Streams support parallel execution
  • (C) Streams store data
  • (D) Streams are reusable

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Q. Which method is used to obtain a sequential stream from a collection?

  • (A) stream()
  • (B) sequentialStream()
  • (C) createStream()
  • (D) newStream()

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