abstract class

[ashutosh.singh.kumar]

Why can't we use abstract class in place of Interface?

 

[Janusch]

Why can't we use abstract class in place of Interface?

Abstract class is a class.

Class has only ONE superclass.

Class can implement many interfaces.

Is this you problem?

Example:
class A extends B implements C,D,E,F,(...),Z{ }
A:class
B:superclass
C - Z: interfaces

Janush
http://kathorncity.no-ip.info/en/

 

[Chase Preuninger]

Because you can only extends 1 class. You use a abstract class when
you fell that it would not make sense for an instance of that class to
be created, but you want to add more than what you can provide with an
interface.

 

[Roedy Green]

Why can't we use abstract class in place of Interface?

you can. For when to use each, see
http://mindprod.com/jgloss/interfacevsabstract.html