Java MCQs with answers Page - 474

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Q. Method references can be used with which Java API feature extensively?

  • (A) I/O API
  • (B) Reflection
  • (C) Streams API
  • (D) Security API

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Q. What is the syntax for a method reference to the current instance's method?

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

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Q. What does `super::method` represent?

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

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Q. Is `ClassName::fieldName` a valid method reference?

  • (A) Yes
  • (B) No
  • (C) Only if field is static
  • (D) Only with Supplier

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Q. Which operator is used in method reference syntax?

  • (A) ::
  • (B) ->
  • (C) =>
  • (D) **

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Q. Which interface does `Supplier<ClassName>` match with?

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

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Q. Method references are available from which Java version?

  • (A) Java 6
  • (B) Java 7
  • (C) Java 8
  • (D) Java 9

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Q. Which method reference can replace `x -> x.toString()`?

  • (A) Object::toString
  • (B) String::valueOf
  • (C) String::substring
  • (D) Integer::parseInt

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Q. Which method reference is valid for invoking an instance method on a particular object?

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

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Q. Which of these is NOT a valid form of method reference?

  • (A) ClassName::staticMethodName
  • (B) ClassName::instanceMethodName
  • (C) objectName::instanceMethodName
  • (D) ClassName::fieldName

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