Java Lambda Expression MCQs with answers Page - 3

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Q. Which of these is NOT a characteristic of lambda expressions in Java?

  • (A) They can access final or effectively final variables.
  • (B) They can have multiple abstract methods.
  • (C) They provide concise syntax.
  • (D) They can be used to instantiate functional interfaces.

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Q. What is the output type of this lambda: `(String s) -> s.length()`?

  • (A) int
  • (B) String
  • (C) boolean
  • (D) double

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Q. Which lambda expression syntax is correct for a function that takes no arguments and returns 5?

  • (A) () -> 5
  • (B) -> 5
  • (C) () => 5
  • (D) (x) -> 5

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Q. Which functional interface is used to evaluate conditions with lambda expressions?

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

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Q. Which method is provided by the Predicate functional interface?

  • (A) apply()
  • (B) get()
  • (C) test()
  • (D) accept()

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Q. What is the result type of `Function<String, Integer>` when applying a lambda like `s -> s.length()`?

  • (A) String
  • (B) Integer
  • (C) Double
  • (D) Boolean

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Q. Which of these interfaces does NOT support lambda implementation?

  • (A) Runnable
  • (B) Comparator
  • (C) Callable
  • (D) Serializable

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Q. What is the main purpose of lambda expressions in Java?

  • (A) To create classes dynamically
  • (B) To reduce code verbosity in implementing functional interfaces
  • (C) To replace constructors
  • (D) To handle exceptions

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Q. Which of the following lambda expressions is valid for a `Predicate<Integer>`?

  • (A) x -> x > 10
  • (B) (x, y) -> x + y
  • (C) () -> true
  • (D) (x) -> x.length()

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Q. In lambda expression `(a, b) -> a + b`, what is required of 'a' and 'b'?

  • (A) Both must be final
  • (B) Both must be of the same type
  • (C) Both must be numbers
  • (D) Both must be parameters of the same functional interface method

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