import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
import java.text.*;
import java.util.regex.*;
class Validations extends JFrame{
JLabel l1,l2;
JLabel lab1,lab2;
JTextField t1;
JPasswordField t2;
JPanel p;

Validations(){
l1=new JLabel("Enter Email:");
t1=new JTextField(20);
l2=new JLabel("Enter Password: ");
t2=new JPasswordField(20);
lab1=new JLabel();
lab2=new JLabel();
p=new JPanel(new GridLayout(2,3));
p.add(l1);
p.add(t1);
p.add(lab1);
p.add(l2);
p.add(t2);
p.add(lab2);
add(p);
setVisible(true);
pack();
lab1.setVisible(false);
lab2.setVisible(false);
t1.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
String email=t1.getText();
String exp="^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
CharSequence seq = email;
Pattern pattern = Pattern.compile(exp,Pattern.CASE_INSENSITIVE);
Matcher m = pattern.matcher(seq);
if (m.matches()) {
lab1.setVisible(false);
}
else {
lab1.setText("*Invalid Email ID");
lab1.setVisible(true);
lab1.setForeground(Color.red);
}
}
});

t2.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
String input = t2.getText();

      if((input.length())==0){
         lab2.setVisible(true);
            lab2.setText("Enter Password!");
            lab2.setForeground(Color.red);
      }
      else{
          lab2.setVisible(false);
      }
    }
});


}
public static void main(String[]args){
Validations v=new Validations();
}
}