Changing to Upper case?

Question

Is easy way to change the input character
from keybord to upper case directly, i mean
at the same time when the user press a key,
the upper case show up on textField? Or i have to do that manually when cursor/mouse
left the textField?
Ali
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Answer 1

cut&paste from the swing doc javax.swing.jtextfield:
public class UpperCaseField extends JTextField {
public UpperCaseField(int cols) {
super(cols);
protected Document createDefaultModel() {
return new UpperCaseDocument();
static class UpperCaseDocument extends PlainDocument {
public void insertString(int offs, String str, AttributeSet a)
throws BadLocationException {
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);
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