Developer and Tester Interview Questions and Answers

Four major concepts in Java are encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: Bundling data and methods together to hide implementation details.

• Inheritance: Creating new classes by inheriting properties and methods from existing classes.

• Polymorphism: Ability of an object to take on many forms, achieved through method overriding and overloading.

• Abstraction: Simplifying complex systems by providing a simplified interface for users.