How to fix the size of the text in a JTextField

Posted on 2001-06-07
Medium Priority
Last Modified: 2010-05-18
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.
Question by:pv_raman

Accepted Solution

sontnvn earned 600 total points
ID: 6166368
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){
                String oldValue =                               textField.getText();
                if (oldValue.length() >= fixLenght)
                super.insertString(offs, str, a);
and then whenever you want to set textfield just do follow:
          new MyDocument(yourTextField,30));
so this text field will recieve max 30 letter.
good luck.

Author Comment

ID: 6190774

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