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Difference Between Interface and Abstract Class in Java & C#
In this post, we will understand the difference between abstract class and interface in Java and C#.
Abstract Class
It contains the declaration and definition part.
Multiple inheritance can’t be implemented using abstract class.
It contains the constructor.
It can also contain some static members.
It can contain multiple types of access modifiers such as public, private, protected.
The performance of an abstract class is very good, because it is quick.
It is used to implement the core identity/functionality of a class.
A class can use only one abstract class.
If many implementations are same, and they have a common behaviour, it is suggested to use an abstract class.
Abstract classes contain methods, fields, constants.
It can be fully implemented, partially implemented or not even implemented.
Interface
It contains a declaration part only.
Multiple inheritance can be achieved using interface.
It doesn’t contain a constructor.
It doesn’t contain static members.
It contains public access modifier since everything in an interface is considered public.
The performance of interface is not good.
It is slow since it needs time to search for an actual method in the respective class.
It is used to implement peripheral abilities of a class.
It can use multiple interface.
If multiple implementations share methods, then the ‘Interface’ can be used.
Interface can contain methods only.
It needs to be fully implemented.
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