Java MCQs with answers Page - 478

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Q. What functional interface would you use with `String::length` in a stream mapping?

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

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Q. Which method reference helps to instantiate a new ArrayList?

  • (A) ArrayList::size
  • (B) ArrayList::add
  • (C) ArrayList::new
  • (D) Collections::emptyList

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Q. Which method reference is ideal for sorting a list of integers?

  • (A) Math::max
  • (B) Integer::compareTo
  • (C) Integer::sum
  • (D) Integer::parseInt

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Q. Which is the method reference equivalent of `(a, b) -> a.compareToIgnoreCase(b)`?

  • (A) String::compareTo
  • (B) String::compareToIgnoreCase
  • (C) String::toLowerCase
  • (D) String::isEmpty

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Q. What method reference would replace `() -> new Employee()`?

  • (A) Employee::getName
  • (B) Employee::new
  • (C) Employee::toString
  • (D) Employee::compareTo

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Q. To map a stream of strings to their uppercase form, which method reference is used?

  • (A) String::toLowerCase
  • (B) String::toUpperCase
  • (C) String::trim
  • (D) String::substring

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Q. Which method reference would map a collection of strings to their lengths?

  • (A) String::length
  • (B) String::valueOf
  • (C) String::charAt
  • (D) String::substring

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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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