• 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 all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Devaka Cooray
  • Knute Snortum
  • Paul Clapham
  • Tim Cooke
Sheriffs:
  • Liutauras Vilda
  • Jeanne Boyarsky
  • Bear Bibeault
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Ron McLeod
  • Piet Souris
  • Frits Walraven
Bartenders:
  • Ganesh Patekar
  • Tim Holloway
  • salvin francis

Sorting Collection of ArrayList  RSS feed

 
Ranch Hand
Posts: 62
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi All,

How to sort a Collection of ArrayList based on the first(date)element of the ArrayList?

For example,(date is in YYYY/MM/DD format)
I have a Collection as: [[2002/02/01,12,34],[2005/02/08,45,67],[2001/02/11,78,91],[2006/01/27,78,34],[2006/01/28,88,45]]

where [2002/02/01,12,34],[2005/02/08,45,67],[2001/02/11,78,91][2006/01/27,78,34],[2006/01/28,88,45] are ArrayLists.

Now I want to sort the above collection on date by desc order as
[[2006/01/28,88,45],[2006/01/27,78,34],[2005/02/08,45,67],[2002/02/01,12,34],[2001/02/11,78,91]]

Please give me some clear idea on this?

Thanks& Regards,
Deepak
 
Ranch Hand
Posts: 166
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Wrap the arrays in their own object and implement the comparator interface. Then you can use Collections.sort to sort the array based on the method provided in the comparator implementation
 
Deepak Kumar
Ranch Hand
Posts: 62
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Thanks Jeremy Wilson
 
Sheriff
Posts: 21743
102
Chrome Eclipse IDE Java Spring Ubuntu VI Editor Windows
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Or use the Collections.sort method that takes a Comparator. That way you can keep using Strings.
 
Screaming fools! It's nothing more than a tiny ad:
ScroogeXHTML - small and flexible RTF to HTML converter library
https://coderanch.com/t/710903/ScroogeXHTML-RTF-HTML-XHTML-converter
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!