JAVA MCQs with answers Page - 370

Dear candidates you will find MCQ questions of JAVA here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Share your questions by clicking Add Question

📊 JAVA
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
💬 Discuss
✅ Correct Answer: (C) System.out::println

Explanation: `System.out::println` prints each element when used in forEach or streams.

📊 JAVA
Q. Which method reference is used to create new objects via Supplier?
  • (A) ClassName::methodName
  • (B) ClassName::new
  • (C) ClassName.new()
  • (D) objectName::new
💬 Discuss
✅ Correct Answer: (B) ClassName::new

Explanation: `ClassName::new` is a constructor reference used with Supplier.

📊 JAVA
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
💬 Discuss
✅ Correct Answer: (C) Employee::compareByName

Explanation: If `compareByName` is a static method, it can be used as `Employee::compareByName`.

📊 JAVA
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
💬 Discuss
✅ Correct Answer: (B) String::compareTo

Explanation: `String::compareTo` is used for natural ordering of strings.

📊 JAVA
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
💬 Discuss
✅ Correct Answer: (B) Instance method of an arbitrary object

Explanation: `Employee::getName` refers to an instance method of arbitrary objects of Employee.

📊 JAVA
Q. Which functional interface is used with `Supplier<Employee> supplier = Employee::new;`?
  • (A) Supplier
  • (B) Function
  • (C) Consumer
  • (D) Predicate
💬 Discuss
✅ Correct Answer: (A) Supplier

Explanation: Supplier represents a no-argument constructor reference.

📊 JAVA
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
💬 Discuss
✅ Correct Answer: (A) Math::abs

Explanation: `Math::abs` converts numbers to their absolute values.

📊 JAVA
Q. Which method reference would replace `str -> str.trim()`?
  • (A) String::toUpperCase
  • (B) String::trim
  • (C) String::substring
  • (D) String::isEmpty
💬 Discuss
✅ Correct Answer: (B) String::trim

Explanation: `String::trim` is used to remove leading and trailing spaces.

📊 JAVA
Q. What is the equivalent method reference for `x -> x.toString()`?
  • (A) Object::toString
  • (B) String::valueOf
  • (C) System.out::print
  • (D) Class::getName
💬 Discuss
✅ Correct Answer: (A) Object::toString

Explanation: `Object::toString` returns the string representation of an object.

📊 JAVA
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
💬 Discuss
✅ Correct Answer: (C) s -> !s.isEmpty()

Explanation: However, there is no direct method reference for negation; still, this lambda form is often used.

Programming Categories

📱 Download Our App

Learn MCQs on the go with our easy-to-use Android app

Get it on Google Play