Java Lambda Expression MCQs with answers Page - 2

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Q. Which functional interface returns a boolean value after testing a condition?

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

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Q. Which method reference operator is used in Java?

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

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Q. Which of the following is a valid lambda expression for no parameters?

  • (A) () -> System.out.println("Hello")
  • (B) () : System.out.println("Hello")
  • (C) () => System.out.println("Hello")
  • (D) lambda: System.out.println("Hello")

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Q. What is captured from the enclosing scope in a lambda expression?

  • (A) Local variables only if they are final or effectively final
  • (B) All variables regardless of finality
  • (C) Class variables only
  • (D) No variables are captured

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Q. Which functional interface does not take any arguments nor return any result?

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

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Q. Can a lambda expression throw a checked exception?

  • (A) No
  • (B) Yes, if declared in the functional interface
  • (C) Only runtime exceptions
  • (D) Only in custom functional interfaces

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Q. Which of these is NOT a benefit of using lambda expressions?

  • (A) Concise code
  • (B) Enabling functional programming
  • (C) Anonymous class elimination
  • (D) Increased memory usage

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Q. Which feature in Java 8 works closely with lambda expressions for collection processing?

  • (A) Streams API
  • (B) Threads API
  • (C) Reflection API
  • (D) Serialization API

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Q. Can lambda expressions be used to override methods in interfaces with multiple abstract methods?

  • (A) Yes
  • (B) No
  • (C) Only if all methods have the same signature
  • (D) Only in abstract classes

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Q. What is the default return type of a lambda expression without a return statement?

  • (A) void
  • (B) int
  • (C) boolean
  • (D) Depends on functional interface

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