Application to edit properties file

All,
any ideas on what framework or library to use to build an app that will edit a properties file.
details:
I have a prop file: file.properties.
QUERY=accountnumber,lastname,dob
CRMFIELDS=AccountNumber,LastName,DOB
TYPES=String,String,Date
So, each item in each list is paired up.
accountnumber=AccountNumber=String, etc....
I am looking to build a drag and drop app to be able to move the items around at will, then publish to
file.properties when done.
I am looking to have 3 columns allowing to drop where I want.
Any frameworks or libraries rec'd : like prototype or scriptaculous, or maybe even javafx.
Trying to get an idea of what you all recommend.

Java's view of .properties files is that they represent a Map<String, String>, i.e. you get a collection of name/value pairs in no particular sequence. If you use the Properties class to read and write properties files then the file will be written in no particular order. There's no problem if the value is a comma separated list.
If you can live with that you can use the Properties class, if not you'll just have to treat it like any other text file.

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