VALIDATING NUMERICAL INPUT IN A JAVA

keyText.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
char c = e.getKeyChar();
if (!((Character.isDigit(c) ||
(c == KeyEvent.VK_BACK_SPACE) ||
(c == KeyEvent.VK_DELETE)))) {
getToolkit().beep();
e.consume();
}
}
});