Java foundamental: 18 MCQs with answers

Q1. What is the purpose of the `public static void main(String[] args)` method in Java?

Q2. What does the `final` keyword mean when applied to a variable?

Q3. What is a constructor in Java?

Q4. What is the purpose of the `this` keyword in Java?

Q5. What is the purpose of the `static` keyword in Java?

Q6. What is the purpose of the `try-catch` block in Java?

Q7. What does the `super` keyword do in Java?

Q8. What is the difference between `public`, `private`, and `protected` access modifiers?

Q9. What is the purpose of the `instanceof` operator?

Q10. What is the difference between `break` and `continue` in loops?

Q11. What is the difference between `int` and `Integer` in Java?

Q12. Explain the concept of garbage collection in Java.

Q13. What is the difference between `==` and `.equals()` in Java?

Q14. What is the difference between an abstract class and an interface in Java?

Q15. What is the difference between method overloading and method overriding?

Q16. What is the difference between `ArrayList` and `LinkedList` in Java?

Q17. What is the difference between checked and unchecked exceptions in Java?

Q18. What is the purpose of the `StringBuilder` class?