İnterface vs abstract class

An abstract class in Object-Oriented Programming (OOP) is a class that cannot be instantiated . In other words, you cannot create an object using the abstract class.

Java Abstract class can implement interfaces without even providing the implementation of interface methods. Java Abstract class is used to provide common method implementation to all the subclasses or to provide default implementation . We can run abstract class in java like any other class if it has main() method.

The abstract keyword is a non-access modifier, used for classes and methods: Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class). Abstract method: can only be used in an abstract class, and it does not have a body.