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From: markspace <markspace@nospam.nospam>
Newsgroups: comp.lang.java.programmer
Subject: Re: Java Swing text as a grid?
Date: Tue, 22 Apr 2014 08:22:58 -0700
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On 4/22/2014 7:50 AM, rupertlssmith@googlemail.com wrote:
> Hi,
>
> I'd like a text UI component that lets me place monospaced text
> within it, using row/column addressing. The built-in text controls


I would just keep a separate structure, an array of lines, and then 
index into that.

public class MyTextArray {

   private JTextArea text = ...
   private ArrayList<String> lines = ...

   public void addText( String line ) {
     lines.add( line );
     text.add( line );
   }

   public char get( int row, int column ) {
     if( row > lines.size() ) throw new IllegalArgumentException();
     String s = lines.get( row );
     if( column >= s.length() ) throw new IllegalArgumentException();
     return s.charAt( column );
   }

}

Flavor to taste.