Java Lambda Expression MCQs with answers Page - 1

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Q. Which Java version introduced Lambda Expressions?

  • (A) Java 6
  • (B) Java 7
  • (C) Java 8
  • (D) Java 9

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Q. Which symbol is used in a lambda expression to separate parameters from the body?

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

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Q. Which of these is a correct lambda expression syntax in Java?

  • (A) (a, b) -> a + b
  • (B) (a, b): a + b
  • (C) (a, b) => a + b
  • (D) lambda a, b: a + b

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Q. Lambda expressions can only be used with:

  • (A) Interfaces with one abstract method
  • (B) All interfaces
  • (C) Abstract classes
  • (D) Enums

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Q. What is the type of a lambda expression?

  • (A) Interface
  • (B) Class
  • (C) Functional Interface
  • (D) Abstract Class

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Q. Which of these is NOT a valid functional interface in Java?

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

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Q. Which keyword is used to define a functional interface?

  • (A) abstract
  • (B) @FunctionalInterface
  • (C) interface
  • (D) final

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Q. Which functional interface is used to represent a function that takes one argument and returns a result?

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

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Q. Which functional interface represents an operation that takes a single input argument and returns no result?

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

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Q. Which functional interface is used when no input is provided but a result is returned?

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

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