How to fix the size of the text in a JTextField

Hi,
How to fix the size of the text in a JTextField.I want to fix the text size in JTextField,if user enters beyond that limit , some beep sound has to come.Is there any method, send me the sample code.Thanks in advance.
rgds
-Raman
pv_ramanAsked:
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sontnvnConnect With a Mentor Commented:
Hi pv raman,
You can create an inner class below to your class

class MyDocument extends PlainDocument {
     int fixLength = 0;
     TextField textField = null;
     public MyDOcument(TextField txtField,
                         int fixValue){
          this.fixLenght = fixValue;
          this.textField = txtField;
     }
     public void insertString(int offs,
               String str, AttributeSet a)
     throws BadLocationException{
          if (str == null){
                       return;
                }
                String oldValue =                               textField.getText();
                if (oldValue.length() >= fixLenght)
                     return;
                super.insertString(offs, str, a);
         }
}
and then whenever you want to set textfield just do follow:
   
     yourTextField.setDocument(
          new MyDocument(yourTextField,30));
so this text field will recieve max 30 letter.
good luck.
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pv_ramanAuthor Commented:
Accepted.
-raman
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