how to set max character length for JTextField in java netbeans

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Java

Swing

I am new to netbeans(7.0.1).Help me to set Max character length in
jTextField

Posted 24-Jun-13 22:49pm

RAMALINGAM.K

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Shubhashish_Mandal · Answer 1 · 2013-06-24T22:56:00

Solution 1

Use PlainDocument to set the max limit. Here is a rough sketch :

Java

public class JTextFieldLimit extends PlainDocument {

  public void insertString( int offset, String  str, AttributeSet attr ) throws BadLocationException {
//put yoyr max length validation logic

super.insertString(offset, str, attr);
  }
}

Posted 24-Jun-13 22:56pm

Shubhashish_Mandal

Updated 24-Jun-13 23:00pm

v2

Comments

RAMALINGAM.K 25-Jun-13 5:11am

Actually i want my textbox to allow only 10 numbers.11th number wont get entered there.Is there any property related to that(like maxlength property in .net)but in Jtextbox properties, there is no maxlength property..am using netbeans (7.0.1)

Shubhashish_Mandal 25-Jun-13 5:18am

Using PlainDocument is the easiest way to do that and its also reusable. However you can add keyListener to read the input ,but its not an acceptable solution.

RAMALINGAM.K 25-Jun-13 5:25am

how do i achieve this using key listener????

TorstenH. 25-Jun-13 5:29am

Click me hard

You should bookmark that page and the surrounding tutorials.

RAMALINGAM.K 25-Jun-13 6:25am

i tried with Plain document but i got error in this line (super.insertString(offs, str, a);)
the error is "no suitable method found for insertString(int,java.lang.String,javax.print.attribute.AttributeSet)
method javax.swing.text.PlainDocument.insertString(int,java.lang.String,javax.swing.text.AttributeSet) is not applicable
(actual argument javax.print.attribute.AttributeSet cannot be converted to javax.swing.text.AttributeSet by method invocation conversion)"

Shubhashish_Mandal 25-Jun-13 6:36am

see the error properly, you will understand what you did wrong. You have to import javax.swing.text.AttributeSet class instead of javax.print.attribute.AttributeSet .

RAMALINGAM.K 25-Jun-13 6:50am

ya got it yaar..thankz for this timely response...

Shubhashish_Mandal 25-Jun-13 6:57am

welcome :) and marked the question answered

Morgan Modise 23-Nov-21 6:15am

I want to set a limit on integers from array that have to be placed in a textbox when pressing a button....I'm using JDK
Here's my code

Import java.util.Random;
Import java.util.Collections;
Import java.util.ArrayList;
Import java.util.Arrays;

List<integer>numbers = Arrays.asList( 1.2.3.4.5.6.7.8.9.10.11.12.25.35.40 );

Collections.shuffle(numbers,new Random ( System.nanoTime()));
and.settext(String.valueOf(numbers));