What is POJO and why we use POJO?
POJO (Plain Old Java Object) is a simple Java class used to encapsulate data without dependencies. It improves modularity, testability and framework.
How does HashMap is implemented using key value pair?
Discover how HashMap works using key-value pairs. Learn how hashing enables fast access, efficient storage, and collision handling in real-world apps.
In which situation the method should be static and when non static?
Learn when to use static vs non-static methods in programming. Discover key use cases, object dependencies, and best practices for efficient design.
Difference between List list = new ArrayList() and ArrayList list = new ArrayList();
Understand the key difference between using a List reference vs ArrayList. Learn how it affects flexibility, abstraction, and programming best practices
Difference between Arraylist and Linked List,In which situation they are used ?
Explore the differences between ArrayList and LinkedList in Java. Learn their use cases, performance traits, and how to pick the right one for your needs.
Will Java provide default constructor by own?
Learn how Java automatically creates a default constructor when no other constructors are defined. Discover its role, behavior, and use in object creation
Explanation about loosely coupled and tightly coupled?
Understand the key differences between loosely and tightly coupled systems in software design. Explore modularity, dependency, flexibility, and maintainability.
Situations when we use Abstraction and Interface?
Discover when to use abstraction and interfaces in object-oriented programming. Learn how they enhance flexibility, scalability, and design clarity in code
Why Object creation not possible in Abstract classes?
Understand why abstract classes in Java can't be instantiated. Learn how abstraction enforces design principles and supports partial implementation logic.
How will you access default and protected class?
Learn how default and protected classes are accessed in Java. Understand package-level visibility, subclass access, and object-oriented design principles.