Win a copy of liveProject: Build an ML Recommender System this week in the Artificial Intelligence and Machine Learning forum!
  • 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
  • Paul Clapham
  • Ron McLeod
  • paul wheaton
  • Devaka Cooray
Sheriffs:
  • Jeanne Boyarsky
  • Tim Cooke
  • Liutauras Vilda
Saloon Keepers:
  • Tim Moores
  • Tim Holloway
  • Stephan van Hulst
  • Carey Brown
  • Piet Souris
Bartenders:
  • salvin francis
  • Mikalai Zaikin
  • Himai Minh

Filtering List

 
Ranch Hand
Posts: 385
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hello fellow developers,

I need to filter a List (java.util.list). I.e. there is a list of people, and each person has a type assigned. How could we filter it, so recipient method would still be able to add/remove from the list, but all iterators and get()'s would act just as if there are only people with type X in it.

Thank you!
 
Sheriff
Posts: 14691
16
Eclipse IDE VI Editor Ubuntu
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I think that you'll have to make a new sublist. I can't imagine of another method.
 
Vladas Razas
Ranch Hand
Posts: 385
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
That's a bit problematic, because the code I give list to, also updates it. And I need those updates synchronized with original list. Here is my code:


I have run into some problems with this approach: sometimes I start getting ConcurrentModificationException. When removing records I have to use iterator's remove. Maybe there is an easy way, I missed somehow?

Thanks!
 
You’ll find me in my office. I’ll probably be drinking. And reading this tiny ad.
Thread Boost feature
https://coderanch.com/t/674455/Thread-Boost-feature
reply
    Bookmark Topic Watch Topic
  • New Topic