JAVA INTERVIEW QUESTION REVISION

1 DIFF B/W INTERFACE AND ABSTRACT Feature Interface Abstract Class Purpose Defines a contract Provides partial abstraction + implementation Methods Mostly abstract methods (Java 8+: default & static allowed) Can have abstract + concrete methods Variables Only public static final (constants) Can have instance variables Constructor ❌ Not allowed ✅ Allowed Inheritance Class can implement multiple interfaces Class can extend only one abstract class Access Modifiers Methods are public by default Methods can have any access modifier Keyword used implements extends 2.