• 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

LinkedHashSet question

 
Greenhorn
Posts: 8
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Has anyone looked at the source for LinkedHashSet - it only overrides constructors on HashSet (or so it appears) in 1.4.0_03 and in 1.4.1_01.
How does this work? (i'm trying to figure out why using the addAll(Collection)/retainAll(Collection) are not working with a collection of a class that has overridden equals and hashcode...
I'm trying to implement union and intersect on a set and want to maintain the order in which they were added...
 
Bob Novak
Greenhorn
Posts: 8
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
should've dug further
turns out that HashSet uses LinkedListMap for the HashMap used to store entries - therefore this works...
it also helps to override hashCode instead of adding a hashcode method in the entries being added to the set...
 
reply
    Bookmark Topic Watch Topic
  • New Topic