import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class TextFieldClass extends JFrame {

    private JTextField textField1;
    private JPasswordField passwordField1;

    public TextFieldClass(){
        super("Event Handling");
        setLayout(new FlowLayout());

        textField1 = new JTextField("Type your login");
        add(textField1);

        passwordField1 = new JPasswordField(15);
        add(passwordField1);

        TextFieldHandler handler = new TextFieldHandler();
        textField1.addActionListener(handler);
        passwordField1.addActionListener(handler);
    }

    public class TextFieldHandler implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent event) {

            String login = "";
            String password = "";

            if(event.getSource() == textField1){
                login = String.format(event.getActionCommand());
            }

            if(event.getSource() == passwordField1){
                password = String.format(event.getActionCommand());
            }

            if(login.equals("cedric") && password.equals("ce")){
                JOptionPane.showMessageDialog(null, "Welkom cedric");
            } else {
                JOptionPane.showMessageDialog(null, "Onbekende gebruiker");
            }
        }
    }

}