Java Lambda Expression MCQs with answers Page - 5

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Q. Which method does the `Runnable` functional interface define?

  • (A) run()
  • (B) execute()
  • (C) apply()
  • (D) start()

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Q. Which feature works closely with lambda expressions to facilitate bulk data operations?

  • (A) Generics
  • (B) Collections
  • (C) Streams API
  • (D) Reflection

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Q. Which functional interface is commonly used to filter elements in a stream?

  • (A) Predicate
  • (B) Function
  • (C) Consumer
  • (D) Supplier

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Q. What does the `Supplier` functional interface represent?

  • (A) Takes input and returns output
  • (B) Takes no input and returns a result
  • (C) Takes input and returns void
  • (D) Returns a boolean result

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Q. Which lambda expression syntax is valid to implement a `Consumer<String>` that prints the string?

  • (A) s -> System.out.println(s)
  • (B) (s) => print(s)
  • (C) s :> System.out.print(s)
  • (D) (s) => System.print(s)

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Q. Which lambda expression counts the length of a string?

  • (A) s -> s.size()
  • (B) s -> s.length()
  • (C) s -> s.count()
  • (D) s -> s.len()

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Q. Can a lambda expression have multiple statements in its body?

  • (A) No
  • (B) Yes, enclosed within curly braces
  • (C) Only if each statement is on a new line
  • (D) Only if using semicolons

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Q. What is the output of `Runnable r = () -> System.out.println("Hello"); r.run();`?

  • (A) Compilation error
  • (B) Hello
  • (C) null
  • (D) Nothing

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Q. Which functional interface returns a result and may throw an exception?

  • (A) Runnable
  • (B) Callable
  • (C) Consumer
  • (D) Supplier

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Q. Which operator is used in method references?

  • (A) ->
  • (B) ::
  • (C) =>
  • (D) **

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