import java.awt.*;
import java.sql.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.regex.*;
class  FormData{
    public static boolean isEmailValid(String email) {
        boolean isValid = false;
        String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
        CharSequence inputStr = email;
        Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);
        if (matcher.matches()) {
            isValid = true;
        }
        return isValid;
    }

    public static void main(String[] args){
    Frame f=new Frame();
    Label label1=new Label("Name: ");
    Label label2=new Label("Email: ");
    final TextField text1=new TextField(20);
    final TextField text2=new TextField(20);
    Button b=new Button("Check");
    b.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
        String v1=text1.getText();
        String v2=text2.getText();
        if(isEmailValid(v2) != true) {
        JOptionPane.showMessageDialog(null,"Invalid Email Id!");
        text2.setText("");
        }

        }
    });
        Panel p=new Panel(new GridLayout(3,2));
        p.add(label1);
        p.add(text1);
        p.add(label2);
        p.add(text2);
        p.add(b);
        f.add(p);
        f.setVisible(true);
        f.pack();
    }
}