Java MCQs with answers Page - 476

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Q. What kind of reference is `Arrays::sort`?

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

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Q. Which method reference form would match `Function<String, Integer> length = String::length;`?

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

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Q. Is `object::staticMethod` a valid method reference?

  • (A) Yes
  • (B) No
  • (C) Only if the method is overloaded
  • (D) Only if the method is private

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Q. What is returned by `Function<String, String> f = String::trim;` when applied to " Hello "?

  • (A) Hello
  • (B) Hello
  • (C) hello
  • (D) HELLO

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Q. Which interface is typically used with `ClassName::new` to provide objects?

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

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Q. In which Java version were method references introduced?

  • (A) Java 7
  • (B) Java 8
  • (C) Java 9
  • (D) Java 10

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Q. Can method references refer to overloaded methods?

  • (A) Yes, if the context determines the correct method
  • (B) No, overloading is not supported
  • (C) Only if methods differ in return type
  • (D) Only for static methods

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Q. Which method reference is commonly used to print each element of a collection?

  • (A) Class::print
  • (B) System.out::print
  • (C) System.out::println
  • (D) System::out

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Q. Which method reference is used to create new objects via Supplier?

  • (A) ClassName::methodName
  • (B) ClassName::new
  • (C) ClassName.new()
  • (D) objectName::new

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Q. What method reference would replace `(e1, e2) -> e1.getName().compareTo(e2.getName())`?

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

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