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How to restrict Charachters in JTextbox

Posted on 2003-12-12
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Last Modified: 2009-12-16
Hello everyone,
     I cannot seem to find a way how to restrict the number of charachters in a JTextbox. I know that there is this Constructor where you can pass the COLUMN size but that doesnt work. Java 1.4 has this JFormattedTextbox where you can set the mask and specify something like "####" to restrict the entries to only 4 charachters, but that has a problem. By default it puts blanks in the textfield and that is a problem.
Thanks
- Adil
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Question by:AdilK
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TimYates earned 300 total points
ID: 9929035
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by:TimYates
ID: 9929041
That link shows you the Pre JDK1.4 way, and the after JDK1.4 way :-)

Good luck!!  

Tim
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LVL 86

Expert Comment

by:CEHJ
ID: 9929047
Can't test this at the moment but try


JTextField tf = new JTextField(4);
tf.setDocument(new FourCharDoc());

.....

class FourCharDoc extends PlainDocument {
      public void insertString(int offs,String str,AttributeSet a) throws BadLocationException {
            if (getLength() < 4)
                  super.insertString(offs,str,a);
      }
      
}
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Expert Comment

by:CEHJ
ID: 9929065
Didn't see that link before post sorry. Use the code they give, not mine.
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Expert Comment

by:TimYates
ID: 9929074
:-)
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