Java Programming - MCQ Practice Questions

Which of the following statements about inheritance in Java is correct?

What is the primary purpose of using the 'super' keyword in Java?

Which of the following correctly describes method overriding in Java?

In Java OOP, which principle ensures that internal details of a class are hidden from the outside world?

Which of the following statements about 'instanceof' operator is true?

In the context of constructors, which statement is correct?

What is the difference between 'this' and 'super' keywords in Java?

Which of the following best describes polymorphism in Java?

An abstract class in Java cannot be instantiated, but it can have concrete methods. Which statement explains why?

Which of the following correctly implements method overloading rules in Java?

In Java, if a child class constructor does not explicitly call the parent class constructor using 'super()', what happens?

Which statement about interface implementation in Java is true?

A developer needs to create a class that cannot be extended and whose instances are immutable. Which keywords should be used?

Which of the following correctly describes the relationship between a class and an interface?

When a static method is called on an instance of a class, what happens?

A company's codebase has a scenario where multiple unrelated classes need to implement a contract with specific methods. Which design choice is best?

Which statement about the 'protected' access modifier is correct?

What will be the output of the following code? class Parent { void display() { System.out.println("Parent"); } } class Child extends Parent { void display() { System.out.println("Child"); } } public class Test { public static void main(String[] args) { Parent p = new Child(); p.display(); } }

Which of the following is NOT a characteristic of an interface in Java?

What is the primary purpose of the 'super' keyword in Java?