• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

use of abstract with interface

 
Ranch Hand
Posts: 18944
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi all,
In the following statement, what is the use of using abstract with interface. Interface means all the methods in the class are abstract, and abstract class means atleast one method is abstract.
"public abstract interface Collection"
can anyone explain this
 
Ranch Hand
Posts: 45
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi shikhar,
Yes, abstract in that decleration is redundant. Every interface is implicitly abstract. This modifier is obsolete and should not be used, though it might compile.
cheers,
vivek
 
Anonymous
Ranch Hand
Posts: 18944
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi Vivek,
if you see the interfaces in util package, every interface is having the signature with abstract and interface.
I think there should be some significance of that.
 
Anonymous
Ranch Hand
Posts: 18944
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi shikhar.you can use the abstract modifier with an interface.The use as such is perfectly legal.But it should not be used as the use is completely redundant.In fact the JLS also frowns upon the declaration "abstract interface I".
 
reply
    Bookmark Topic Watch Topic
  • New Topic