What is difference between abstract class and interface?

What is difference between abstract class and interface?

Main difference is methods of a Java interface are implicitly abstract and cannot have implementations. A Java abstract class can have instance methods that implements a default behavior. … An abstract class may contain non-final variables. Members of a Java interface are public by default.

Where we can use interface and abstract class in C#?

As a class can implement more than one interface and only inherit from one abstract class. An interface is mainly used only when we do not require the implementation of methods or functionalities. An abstract class is used when we do require at least default implementation.

What is the use of abstract class in C#?

The purpose of an abstract class is to define some common behavior that can be inherited by multiple subclasses, without implementing the entire class. In C#, the abstract keyword designates both an abstract class and a pure virtual method.

What is the difference between class and abstract class?

The only real difference is that a concrete class can be instantiated because it provides (or inherits) the implementation for all of its methods. An abstract class cannot be instantiated because at least one method has not been implemented. Abstract classes are meant to be extended.