This week's book giveaway is in the JavaScript forum.
We're giving away four copies of Cross-Platform Desktop Applications: Using Node, Electron, and NW.js and have Paul Jensen on-line!
See this thread for details.
Win a copy of Cross-Platform Desktop Applications: Using Node, Electron, and NW.js this week in the JavaScript forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic

Tree Map Sort & foreign languages  RSS feed

 
E Robb
Ranch Hand
Posts: 111
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I have a tree map that I want to sort on the key. Works fine as long as you use english. When you get into other languages that have accents the sort does not work correctly. In java script there is a call you can use for a more natural search called localeCompare.

Is there a way in java to make a TreeMap have a more natural search?



sortedMap returns btest, ctest, ztest in the correct order. Now if you add a character like optList.put("ét", "1") to the hashmap ét and run it through the tree map it always returns it at the end of the list instead of between ctest & ztest key.

Can a TreeMap do a natural sort that will understand that order of the keys returned should be btest, ctest, ét, ztest?

Thanks
 
Paul Clapham
Sheriff
Posts: 22374
42
Eclipse IDE Firefox Browser MySQL Database
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Yes, because you can create a TreeMap which uses a Comparator which you define.

If you check out the API documentation for Comparator you will see that one of the standard classes which implements it is Collator. So for example if you wanted to collate strings according to the rules for French (as per your example), you could use

to make that happen. Like this:
 
E Robb
Ranch Hand
Posts: 111
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Brilliant thank you!
 
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!