How can I format a textfield control according to column width?

Question

Hi!
Someone can help me?
I have a column on the database that is VARCHAR2(2).
On the frame , I want that the user enter a value delimited with 2 characters, but I don't now how.
I have changed de property of the column on the rowset of the view, but I don't have success.
Thank4s in advance for any help.
Vania
(Sorry for my bad english)

Answer 1

Here it is.
You can inastantiate a text field object of following class(limited two char input) like this:
myUpperCaseField myField = new myUpperCaseField(2);
Note: this class also upper cased the char input. You should doing some change in this code,if you are not concern on upper case.
import javax.swing.text.*;
import oracle.dacf.control.swing.*;
import java.awt.Toolkit;
public class myUpperCaseField extends TextFieldControl {
int fixedLength=0;
public myUpperCaseField(int cols) {
super(cols);
fixedLength = cols;
public myUpperCaseField() {
super();
fixedLength = 0;
protected Document createDefaultModel() {
return new UpperCaseDocument();
public void setFixedLength(int length){
if(length < 0){
fixedLength = 0;
else{
fixedLength = length;
public int getFixedLength(){
return fixedLength;
protected class UpperCaseDocument extends PlainDocument {
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
if(getFixedLength() > 0){
if(getLength() + str.length() > getFixedLength()){
Toolkit.getDefaultToolkit().beep();
return;
if (str == null) {
return;
char[] upper = str.toCharArray();
for (int i = 0; i < upper.length; ++i) {
upper[i] = Character.toUpperCase(upper);
super.insertString(offs, new String(upper), a);
}//end of class
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