How to make jTextField 's input unscrollable?

[walter wang]

Dear All
i create a JTextField, i want to set it inputsize = 5(charaters)
i am doing like this
JTextField jTextField = new JTextField(5);
jTextField.setScrollOffset(0);
but it doesnot work out
it is still scrollable, i main i could input more than
5 charaters
How to fix JTextField's input size?
Thx in advance
Walter wang

[Paul Stevens]

You need to create a class that extends PlainDocument and override the insertString() like this:

 public void insertString(int offset, String str, AttributeSet attr)
       throws BadLocationException {
       if (str == null) return;
       String result = null;
       //if entered string will go beyond the max columns do not allow.
//columns instance variable containing number of columns
       if (getLength () == columns) {            
return;
       }
       //if the string pasted in longer than max columns truncate
       if (getLength () + str.length () > columns_) {
           result = str.substring (0, columns_);
       } else {
           result = str;
       }
       super.insertString (offset, result, attr);
   }

[This message has been edited by Paul Stevens (edited December 17, 2001).]