Interface object definition starts with keyword interface while abstract class start with keyword abstract class
Abstract class is a class which contain one or more abstract methods which has to be implemented by sub classes while Interface is a Java Object containing method declaration and doesn't contain implementation
Classes which implement Interfaces must provide method definition for all Interface methods.
By default what ever variables we declare in interface are public static final where as in abstract class they can be default and instance variables also
Abstract classes are useful in a situation that some general methods should be implemented and specialization behavior should be implemented by child classes. Interfaces are useful in a situation that all properties should be implemented we can use this scenario
