Without implementation an abstract class does the same as an interface. Compared to interfaces abstract classes can have implementation. Java does not support multiple inheritanceĪbstract classes allow you to provide default functionality for the subclasses. Variable and Members scope – you can declare fields that are not static and final, and define public, protected, and private concrete methods.A Java abstract class can have the usual flavors of class members like private, protected, etc. 3.Members of a Java interface are public by default. An abstract class may contain non-final variables. 2.Variables declared in a Java interface is by default final. With out implementation, an abstract class is same as an interface A Java abstract class can have instance methods that implements a default behavior. Implementation – An abstract class can have implementation.Trying to instantiate an abstract class only produces a compiler error Object Instantiation – An object cannot be formed from a abstract class.It is mostly used to provide base for subclasses to extend and implement the abstract methods and override or use the implemented methods in abstract class.It allows you to provide default functionality for the subclasses.Definition – An abstract class is a superclass that cannot be instantiated and is used to define general characteristics.Interface methods are public, abstract and never final. Extend multiple interface – An interface can extend multiple interfaces.The only fields that can appear in an interface must be declared public, static and final Variables scope – An interface cannot contain instance fields.public – since the interface specifies a set of exposed behaviors, all methods are implicitly public.Abstract because the there is no implementation.Interface methods scope – All of the methods in an interface are abstract and public.A class that implements an interface must implement all the methods in an interface. An interface is not extended by a class it is implemented by a class Implementation – The interface does not contain any implementation.
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