Java MCQs with answers Page - 475

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Q. Given `Comparator<String> comp = String::compareToIgnoreCase;`, what does the method reference resolve to?

  • (A) Comparator comparing case-sensitive strings
  • (B) Comparator comparing case-insensitive strings
  • (C) Sorting strings by length
  • (D) It won't compile

A

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Q. What type of method reference is `this::equals`?

  • (A) Static method reference
  • (B) Instance method of a specific object
  • (C) Constructor reference
  • (D) Instance method of arbitrary object

A

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Q. Which functional interface matches with `String::new` when used with a Supplier?

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

A

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Q. Which method reference replaces `s -> s.isEmpty()`?

  • (A) String::isEmpty
  • (B) String::length
  • (C) String::substring
  • (D) String::equals

A

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Q. Which method reference is equivalent to `(list, e) -> list.add(e)`?

  • (A) List::size
  • (B) List::add
  • (C) Collections::sort
  • (D) List::get

A

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Q. Method references require the functional interface to match in:

  • (A) Return type only
  • (B) Parameter list and return type
  • (C) Parameter names only
  • (D) Return type only, parameters optional

A

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Q. What does `super::methodName` refer to?

  • (A) Superclass method
  • (B) Static method
  • (C) Instance method of the same class
  • (D) Constructor of the superclass

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Q. Which is a valid method reference for creating a new `ArrayList`?

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

A

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Q. In which scenario can method references replace a lambda?

  • (A) When the lambda body contains multiple statements
  • (B) When lambda only invokes a method
  • (C) When lambda throws exceptions
  • (D) When lambda accesses outer variables

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Q. Which is the correct method reference for `String::valueOf`?

  • (A) Converts primitives to Strings
  • (B) Calculates length of String
  • (C) Checks if String is empty
  • (D) Returns a substring

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