Hi Friend,

Try the following code:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.text.*;
class Validations extends JFrame{
JLabel l1,l2,l3,l;
JLabel lab1,lab2,lab3;
JTextField t1,t2,t3;
JPanel p;

Validations(){
l1=new JLabel("Enter Date: (MM/dd/yyyy)");
t1=new JTextField(20);

lab1=new JLabel();

p=new JPanel(new GridLayout(2,2));
p.add(l1);
p.add(t1);
p.add(lab1);
add(p);
setVisible(true);
pack();
lab1.setVisible(false);
t1.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
String date=t1.getText();
if(isValidDate(date)){
lab1.setVisible(false);
}
else{
lab1.setText("* Invalid date");
lab1.setForeground(Color.red);
lab1.setVisible(true);
}
}
});

}
public boolean isValidDate(String inDate) {

if (inDate == null)
return false;
SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
dateFormat.setLenient(false);
try {
dateFormat.parse(inDate.trim());
}
catch (ParseException pe) {
return false;
}
return true;
}
public static void main(String[]args){
Validations v=new Validations();
}
}

Thanks