Java Lambda Expression MCQs with answers Page - 4

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Q. Which annotation helps in identifying a functional interface?

  • (A) @FunctionalInterface
  • (B) @Override
  • (C) @Lambda
  • (D) @Functional

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Q. Which statement is true about lambdas and anonymous classes?

  • (A) Both can have multiple methods
  • (B) Lambdas have less boilerplate code than anonymous classes
  • (C) Lambdas can extend classes
  • (D) Anonymous classes are faster than lambdas

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Q. Which of the following is a valid lambda expression that accepts two integers and returns their sum?

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

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Q. Can lambdas be used to replace anonymous inner classes that implement listeners in GUI?

  • (A) Yes
  • (B) No
  • (C) Only in Swing
  • (D) Only in JavaFX

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Q. In which scenario is using a lambda not possible?

  • (A) When implementing Runnable
  • (B) When implementing Comparator
  • (C) When implementing an interface with multiple abstract methods
  • (D) When using Stream API

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Q. Which Stream API method is commonly used with lambdas?

  • (A) map()
  • (B) start()
  • (C) execute()
  • (D) invoke()

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Q. What is the default behavior of variables captured in lambdas?

  • (A) They must be mutable
  • (B) They must be final or effectively final
  • (C) They can be reassigned
  • (D) They are ignored

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Q. What is the purpose of method references in the context of lambdas?

  • (A) To create a new interface
  • (B) To refer to methods directly as a lambda alternative
  • (C) To override methods
  • (D) To convert lambdas to strings

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Q. Which of the following functional interfaces is used to perform operations on primitive int values?

  • (A) IntConsumer
  • (B) IntFunction
  • (C) IntPredicate
  • (D) All of the above

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Q. What does a lambda expression represent in Java?

  • (A) An object
  • (B) An instance of a functional interface
  • (C) A class
  • (D) A method

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