Swing 04A

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

class Example03A {
    public static void main(String[] args) {
        JFrame jFrame = new JFrame();
        JPanel jPanel = new JPanel();
        JTextField jTextField = new JTextField(10);
        jTextField.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                JOptionPane.showMessageDialog(null, "Hai digitato "+ e.getKeyChar());
            }
        });

        jPanel.add(jTextField);


        Container c = jFrame.getContentPane();
        c.add (jPanel);  // aggiunge p al Container c

        jFrame.setSize (100,100);
        jFrame.setVisible(true);
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}