Hi Friend,

Use the following code if you want to validate textfields TRollNo and TName

TRollNo.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
String input=TRollNo.getText();
Pattern p = Pattern.compile("[A-Z,a-z,&%$#@!()*^]");
Matcher m = p.matcher(input);
if (m.find()) {
JOptionPane.showMessageDialog(null, "Please enter only numbers");
}
}
});
TName.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
String input=TName.getText();
Pattern p = Pattern.compile("[0-9]");
Matcher m = p.matcher(input);
if (m.find()){
JOptionPane.showMessageDialog(null,"Enter only characters A-Z or a-z");
}
}
});

Thanks