Re: latest 500 lines in a JtextArea inside a JScrollPane

Knute Johnson <>
Wed, 22 Jul 2009 09:22:57 -0700
etantonio wrote:

Good morning,
I've a JtextArea inside a JScrollPane,
I use an append to add lines to the JtextArea , my problem is that the
lines I add are very much so at the end this crash JVM, there's an
automatic way to limit the number of lines in the jtextarea in a way
that for example I've only latest 500 lines ?



I use the following code all the time for a logging window so I don't
have overflow problems. When the limit is exceeded, some of the front
of the document is removed.

// LengthLimitedDocument

package com.knutejohnson.classes;

import javax.swing.text.*;

public class LengthLimitedDocument extends PlainDocument {
     private int limit;

     public LengthLimitedDocument(int limit) {
         this.limit = limit;

     public void insertString(int offs, String str, AttributeSet a)
      throws BadLocationException {
         super.insertString(offs, str, a);
         int length = getLength();
         if (length > limit)
             remove(0,limit/20); // remove 5% of document if over limit


Knute Johnson
email s/nospam/knute2009/

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