Method Reference MCQs with answers Page - 3

You will find multiple-choice questions (MCQs) related to #Method Reference here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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Q. Which form of method reference is used to refer to an instance method of an existing object?

  • (A) ClassName::methodName
  • (B) object::methodName
  • (C) ClassName::new
  • (D) ClassName::staticMethod

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Q. Which functional interface is most suitable for `System.out::println`?

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

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Q. Which form of method reference is `ClassName::staticMethodName`?

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

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Q. Which is a valid method reference to a constructor?

  • (A) ClassName::methodName
  • (B) ClassName::new
  • (C) new::ClassName
  • (D) ClassName::create

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Q. Which method reference is equivalent to `str -> str.trim()`?

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

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Q. What is the output of `Arrays.asList("a", "b").forEach(System.out::println);`?

  • (A) No output
  • (B) Prints 'a' and 'b' on separate lines
  • (C) Prints 'ab'
  • (D) Compilation error

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Q. Method references can replace lambdas when:

  • (A) Lambda only calls a method
  • (B) Lambda has multiple statements
  • (C) Lambda throws an exception
  • (D) Lambda modifies external variables

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Q. Which is the correct way to reference an instance method on an arbitrary object?

  • (A) object::method
  • (B) ClassName::method
  • (C) ClassName::new
  • (D) this::method

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Q. Which method reference type allows creating new object instances?

  • (A) Static method reference
  • (B) Instance method reference
  • (C) Constructor reference
  • (D) Field reference

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Q. What does `Function<String, Integer> lengthFunc = String::length;` do?

  • (A) Creates a string
  • (B) Maps string to its length
  • (C) Converts integer to string
  • (D) Checks if string is empty

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