Interface Vs Abstract Class | In Java | Interview Question

Interface: An interface in Java defines a contract that multiple classes can implement. It contains abstract methods (before Java 8) and can include default and static methods (since Java 8). Interfaces support multiple inheritance and only allow public, static, and final fields.

Abstract Class: An abstract class in Java serves as a base class with common behavior and abstract methods that subclasses must implement. It can have both abstract and concrete methods, instance variables, and constructors. Unlike interfaces, a class can extend only one abstract class.