What is the difference between a class, an abstract class, and an interface?

Question

Anonymous · Accepted Answer

Class - definition of object
Abstract class - partially defined (incomplete - definitions without implementation)
Interface - blueprint of class without any implementation

Sigiloso · Answer

Class is code and definition of an object
An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
An interface indicates that the inheriting children is capable of doing something (no property)

Ghanish Singla · Answer

Combining all three, the basic difference is that class can implement more than one interface but can only inherit from only 1 base class.

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