ackage ex;
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 TextFieldFrame extends JFrame {
    private JTextField textField1;
    private JTextField textField2;
    private JTextField textField3;
    private JPasswordField passwordField;
    public TextFieldFrame (){
        super("Teste");
        setLayout (new FlowLayout ());
        textField1 = new JTextField (10);
        add (textField1);

        textField2 = new JTextField ("Enter");
        add (textField2 );

        textField3 = new JTextField ("Digite o seu nome",21);
        textField3.setEditable (false);
        add (textField3);

        passwordField = new JPasswordField ("  ");
        add (passwordField);

        TextFieldHandler handler = new TextFieldHandler ();
        textField1.addActionListener (handler);
        textField2.addActionListener (handler);
        textField3.addActionListener (handler);
        passwordField.addActionListener (handler);
    }
    private class TextFieldHandler implements ActionListener
    {
       public void actionPerformed (ActionEvent event){
           String string = "";
           if (event.getSource () == textField1)
               string = String.format ("textField1: %s", event.getActionCommand ());
           else if (event.getSource () == textField2)
               string = String.format ("textField2: %s", event.getActionCommand ());
           else if (event.getSource () == textField3)
               string = String.format ("textField3: %s", event.getActionCommand ());
           else if (event.getSource ()== passwordField)
               string = String.format ("passwordField: %s", event.getActionCommand());

           JOptionPane.showMessageDialog (null, string);       }
    }}