- Explain the four pillars of Object-Oriented Programming (OOP).

Answer:
The four pillars of OOP are:
- Encapsulation: Wrapping data and methods into a single unit (class).
- Inheritance: Mechanism where one class inherits the properties and behavior of another class.
- Polymorphism: Ability of a class to take many forms, typically through method overriding and overloading.
- Abstraction: Hiding implementation details and exposing only the essential features of an object.
- What is the difference between final, finalize, and finally in Java?

Answer:
- final: Used to declare constants, prevent method overriding, and prevent inheritance of classes.
- finalize: A method in the Object class used for garbage collection before the object is destroyed.
- finally: A block used for code that must be executed regardless of whether an exception occurs or not.
- Explain the difference between == and equals() in Java.

Answer:
== compares object references (memory locations), whereas equals() compares the actual content or state of the objects.




- What is the difference between method overloading and method overriding?

Answer:
- Overloading: Defining multiple methods with the same name but different parameter lists within the same class.
- Overriding: Redefining a method in a subclass that already exists in the superclass, to provide a specific implementation.
- What is polymorphism in Java, and how is it implemented?

Answer:
Polymorphism allows objects of different classes to be treated as objects of a common superclass. It is implemented through method overriding and method overloading.
- What is the use of the super keyword in Java?

Answer:
The super keyword is used to refer to the superclass of the current object. It is used to call superclass methods, constructors, or access superclass variables.
- Can you explain Java's access modifiers (private, protected, default, and public)?

Answer:
- private: Restricts access to the member within the same class.
- protected: Allo

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