Java Lambda Expression MCQs with answers Page - 7

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Q. Which of the following is a correct lambda expression with no parameters that returns 100?

  • (A) () -> 100
  • (B) (x) -> 100
  • (C) x -> 100
  • (D) () => 100

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Q. Which lambda expression will reverse a given string 's'?

  • (A) s -> new StringBuilder(s).reverse().toString()
  • (B) s -> s.reverse()
  • (C) s -> s.revert()
  • (D) s => reverse(s)

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Q. What does the following lambda expression represent: `x -> x % 2 == 0`?

  • (A) Checks if a number is odd
  • (B) Checks if a number is even
  • (C) Always returns true
  • (D) Returns the same number

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Q. Can a lambda expression return a value?

  • (A) Yes, always
  • (B) Only if it is a Predicate
  • (C) No, lambdas can't return values
  • (D) Only if the return type is void

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Q. What is the type of `x -> x.toUpperCase()` if x is a String?

  • (A) Predicate<String>
  • (B) Function<String, String>
  • (C) Consumer<String>
  • (D) Supplier<String>

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Q. Which of the following can lambda expressions NOT directly implement?

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

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Q. What is the role of parentheses in lambda expressions?

  • (A) To wrap the body
  • (B) To enclose parameters
  • (C) To declare return type
  • (D) To define exceptions

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Q. Can lambda expressions contain loops?

  • (A) No
  • (B) Yes, in the body if braces are used
  • (C) Only while loops
  • (D) Only for-each loops

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Q. What is the purpose of method references like `String::length`?

  • (A) To create a new object
  • (B) To call constructors
  • (C) To refer to an existing method
  • (D) To define a variable

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Q. Which functional interface represents a function that returns a value of type T and takes no arguments?

  • (A) Supplier<T>
  • (B) Function<T,R>
  • (C) Consumer<T>
  • (D) Predicate<T>

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