What is abstract class and interface in Java
Difference between abstract class and interface in Java is one of the tricky Java interview question and mostly appear in core Java interviews. Both interface and abstract class is a way to achieve abstraction in Java but there are significant difference between both of them. some time interviewer also not just focus on key differences between abstract class and interface in Java but also interested in When to use interface in Java and When to use abstract class is Java, This is a tricky pat of this interview question and  you must have good understanding of What is interface and abstract class in Java and How to use them. Anyway in this Java article we will first see some syntactical difference between interface and abstract class in Java programming language and later we will see where to use abstract class and interface