difference between abstract class and interface

[ankur sharma]

In Interface we can only declare the methods but can not implement as well as by declaring a method in Interface ,it automatically becomes abstract method.
And we can only declare the variables but can not initialized in Interface.
To use the methods and variables we have to implement the interface.


In Abstract Class we can declare the abstract method as well as normal methods.Diffrence is that we can not implement the abstract method there but implement the normal methods. and abstract method will be Accessible by inherited classes...


further any confusion then ur most welcome

[lilkar]

Interface
Interfaces are implemented
Interfaces cannot have constructors
Multiple interfaces can be implemented(thereby allowing multiple inheritance)
Interfaces can only contain abstract methods or functions
all the members of an interface are public by default and cannot be explicitly declared so
All the methods/functions of an interface must be impelmented


Abstract Class
Abstract classes are Inherited
Only a single class can be inherited
Abstract classes can have both abstract and contrete methods
All the abstract members of an Abstract Class must be declared public
All the abstract methods/functions of an Abstract class must be implemented