Java MCQs with answers Page - 477

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Q. In the real-world, which method reference helps when sorting a list of strings alphabetically?

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

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Q. Which type of method reference is `Employee::getName` when used in mapping operations?

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

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Q. Which functional interface is used with `Supplier<Employee> supplier = Employee::new;`?

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

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Q. What method reference is appropriate for converting a list of numbers to their absolute values using streams?

  • (A) Math::abs
  • (B) Integer::parseInt
  • (C) Number::intValue
  • (D) Collections::max

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Q. Which method reference would replace `str -> str.trim()`?

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

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Q. What is the equivalent method reference for `x -> x.toString()`?

  • (A) Object::toString
  • (B) String::valueOf
  • (C) System.out::print
  • (D) Class::getName

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Q. Which method reference can replace a lambda used in filtering non-empty strings?

  • (A) String::isEmpty
  • (B) String::equals
  • (C) s -> !s.isEmpty()
  • (D) String::isBlank

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Q. What is the correct method reference to print each element in a list?

  • (A) this::print
  • (B) System::println
  • (C) System.out::println
  • (D) Console::log

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Q. Which type of method reference is `System.out::println`?

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

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Q. What method reference could map Employee objects to their ages?

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

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