Can a class inherit both from an abstract class and an interface at the same time?

An interface can inherit multiple interfaces but cannot inherit a class. An abstract class can inherit a class and multiple interfaces. An interface can have only public abstract methods. An abstract class has protected and public abstract methods.

Click to read further detail. Consequently, can a class inherit both from an abstract class and an interface at the same time in C#?

An interface is mostly considered to be a pure abstract class. In C#, two classes (either abstract or concrete) cannot be inherited by the same derived class. It causes ambiguity in the derived class if both have the same method signature. We can do multiple inheritance in C# using interfaces.

is abstract class can be inherited? An abstract class cannot be inherited by structures. It can contains constructors or destructors. It can implement functions with non-Abstract methods. It cannot support multiple inheritance.

Keeping this in view, does abstract class support multiple inheritance?

Basically, the rule says that you can inherit from (extend) as many classes as you want, but if you do, only one of those classes can contain concrete (implemented) methods. A class can extend at most one abstract class, but may implement many interfaces. That is, Java supports a limited form of multiple inheritance.

Can an interface extend an abstract class?

Members of a Java interface are public by default. An interface can extend another Java interface only, an abstract class can extend another Java class and implement multiple Java interfaces. A Java class can implement multiple interfaces but it can extend only one abstract class.