sort csv with multiple columns using Java

Posted on 2014-04-16
Medium Priority
Last Modified: 2015-10-24
I have a file with a header and multiple rows. I need a way to read the file and sort it based of SIDE, REF1, Ref2,Account or in another order, defined by the header. I don't have the full java skills to write the sorting code. I need to do it in java because I'm doing another process for validating other info from the file.


Question by:ramanjitsingh04
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
LVL 16

Expert Comment

ID: 40005421
Usually - meaning on every occasion - the crew here would need to see some attempt at code from *you* first.

Author Comment

ID: 40005435
Well truthfully I'm researching what I can... But I'm getting odd solutions. I'm hoping someone can help guide me here and can point me in a direction. The example I gave above is a smaller version of a larger file. The sorting has to happen up to 8 different columns.

I was considering a arraylist for the whole string, and using a string as a key column for the array and then using collection.sort to sort the key and then using CSVwritter to print to a file. But I don't understand the collection.sort and how to use the arraylist as a key.
LVL 16

Assisted Solution

krakatoa earned 1000 total points
ID: 40005450
Have you looked at implementing the Comparable interface, and then Collections.sort()?

Accepted Solution

Mark Olsen earned 1000 total points
ID: 40009802
Going with an object oriented approach I would make an object that represents each row with a field for each column. Then make objects that extend the Comparator interface for each column.

When reading in the header of the file the code would need decide which comparator to use. Once the data has been read and fed into a Collection, you then call Collections.sort() and pass in the comparator.

Featured Post

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.
Suggested Courses
Course of the Month14 days, 4 hours left to enroll

800 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question