Java Functional Interface MCQs with answers Page - 1

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Q. What is a functional interface in Java?

  • (A) An interface with default methods only
  • (B) An interface with exactly one abstract method
  • (C) Any interface with static methods
  • (D) Any abstract class

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Q. Which annotation is used to indicate a functional interface?

  • (A) @Override
  • (B) @FunctionalInterface
  • (C) @Deprecated
  • (D) @Interface

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Q. Which of the following is a functional interface?

  • (A) Runnable
  • (B) Serializable
  • (C) Comparable
  • (D) Cloneable

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Q. Which method is declared by the functional interface `Supplier`?

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

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Q. What is the purpose of the `Predicate` functional interface?

  • (A) Consume an input and produce a result
  • (B) Test a condition on input and return boolean
  • (C) Supply values with no input
  • (D) Chain multiple consumers

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Q. Which method does `Consumer` functional interface define?

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

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

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

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Q. What does the `Function` functional interface do?

  • (A) Consumes a value
  • (B) Produces a boolean
  • (C) Transforms input to output
  • (D) Runs in a new thread

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Q. Which functional interface method is defined in `Predicate`?

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

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

  • (A) Runnable
  • (B) Callable
  • (C) Cloneable
  • (D) Supplier

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