import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JOptionPane;

public class tuna extends JFrame {
    private JTextField item1;
    private JTextField item2;
    private JTextField item3;
    private JPasswordField passwordfield;

    public tuna() {
        super("The Title");
        setLayout(new FlowLayout());

        item1 = new JTextField(10);
        add(item1);

        item2 = new JTextField("Enter Text Here");
        add(item2);

        item3 = new JTextField("Uneditable, 20");
        item3.setEditable(false);
        add(item3);

        passwordfield = new JPasswordField("mypass");
        add(passwordfield);

        thehandler handler = new thehandler();
        item1.addActionListener(handler);
        item2.addActionListener(handler);
        item3.addActionListener(handler);
        passwordfield.addActionListener(handler);
    }

    private class thehandler implements ActionListener {
        public void actionPerformed(ActionEvent event){
            String string = "";
            if(event.getSource() == item1){
                string = String.format("field 1: %s",event.getActionCommand());
            } else if(event.getSource() == item2){
                string = String.format("field 2: %s",event.getActionCommand());
            } else if(event.getSource() == item3){
                string = String.format("field 3: %s",event.getActionCommand());
            } else if(event.getSource() == passwordfield){
                string = String.format("Password: %s",event.getActionCommand());
            }
            JOptionPane.showMessageDialog(null, string);
        }
    }
}