How to reach that a jtextfield only accept characters?...

Question

I tried it...doing:
http://forum.java.sun.com/thread.jsp?forum=57&thread=394377&tstart=0&trange=15
But.....i realized that is necesary to introduce the exact number of characters so the characters don't be removed.....somebody has other idea or suggestion about how is the best way to reach it?....
Thnaks in advance..
Mary....

Answer 1

You just need to create a class that extends PlainDocument, and override the method insertString, try using the codes, I haven't tested the code but it should work:
public class CharacterField extends JTextField {
public CharacterField(int cols) {
super(cols);
protected Document createDefaultModel() {
     return new CharacterDocument();
class CharacterDocument extends PlainDocument {
public void insertString(int offs, String str, AttributeSet a)
     throws BadLocationException {
/*Here str is the string typed or pasted by the user
     if (/*Condition or match for being characters*/) {
     super.insertString(offs, str, a);
Create an object of the CharacterField class and it will accept only the string which matches your condition.