Abstract class vs Concrete class

 Following are the important differences between an abstract class and a concrete class.

Sr. No.	Key	Abstract Class	Concrete Class
1	Supported Methods	Both abstract and concrete methods can be found in an abstract class.	Only concrete methods are allowed in a concrete class. The class is abstract, even if it only has one abstract method.
2	Instantiation	The new keyword cannot be used to create an abstract class.	The concrete class can be instantiated using the new keyword.
3	Abstract method	Abstract methods may or may not exist in abstract classes.	There can’t be an abstract method for the concrete class.
4	Final	A final class cannot be declared for an abstract class.	It is possible to declare a concrete class to be final.
5	Keyword	The abstract keyword is used to declare a class.	The abstract keyword is not present in the declaration of a concrete class.
6	Inheritance	The extends keyword allows an abstract class to inherit another class and implement an interface.	Only an interface can be inherited by an interface.
7	Interface	An interface cannot be implemented solely by an abstract class. To be able to use the interface for instantiation, a child class is required.	It is simple to create an interface.

Note: also read about the Regular class vs static nested class

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