• Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

but what useful of them at real time ?

 
moneer mohammed
Ranch Hand
Posts: 66
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Please can any one tell me when I need use abstract class and interface I know what different but what useful of them at real time when I have project
 
Nicholas Cheung
Ranch Hand
Posts: 4982
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
As Java does not support multiple inheritance, when you need to have a class (or abstract class) that contains various features, you have to use interfaces.

Nick
 
moneer mohammed
Ranch Hand
Posts: 66
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
ok but agian i need to impelement all the methods so no usefull
please give me example
 
deshdeep divakar
Ranch Hand
Posts: 91
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Hi,
Nicolas is right,When u have to use an abstract
class the methods in abstract class have to be
marked abstract,and when this class is subclassed,
subclass need to provide the relevant implementation for
each abstract method,while interfaces methods in Interfaces
are abstract by virtue of their declaration,and
should not be declared abstract.Also an Interface
is abstract by definition and therefore cannot
be instayiated.it should not be declared abstract.
 
Nischal Tanna
Ranch Hand
Posts: 182
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Originally posted by Nicholas Cheung:
As Java does not support multiple inheritance, when you need to have a class (or abstract class) that contains various features, you have to use interfaces.

Nick



Wow nick what a long list of degrees ?..a studious guy i shud say
 
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic