• 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

class implementing an interface

 
Ranch Hand
Posts: 386
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
A class implementing an interface has to define all methods in an interface.

ArrayList implements List interface. List interface has 25 abstract methods. When I checked ArrayList class , it has 20 methods. Some of which may be completely new for this class. So, does this ArrayList class only contain all methods in List interface or only methods that have some code in them ?

Thanks
 
Sheriff
Posts: 14691
16
Eclipse IDE VI Editor Ubuntu
  • Likes 1
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Does ArrayList extend another class, which already implements some methods from the List interface ?
 
Ranch Hand
Posts: 75
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
[Deleted]
 
Marshal
Posts: 79177
377
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Sai Roy, please go here, where you will read this:-

We're all here to learn, so when responding to others, please focus on helping them discover their own solutions, instead of simply providing answers.

By providing a complete answer you are depriving nirjari patel of the opportunity to learn how to find such information for oneself.
Please don't be annoyed, but I have pulled rank and deleted the solution and explanation, NP will actually have a chance to learn how to navigate the API documentation.
 
What's wrong? Where are you going? Stop! Read this tiny ad:
a bit of art, as a gift, that will fit in a stocking
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic