package grafica;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

import java.awt.event.*;

public class CampoDiTesto {

	public static void main(String[] args) {
		
		JFrame f = new JFrame("Questa è la mia finestra");
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		JPanel p = new JPanel();
		f.setContentPane(p);
		
		final JTextField testo = new JTextField(20);
		
		testo.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				testo.setText(""+testo.getText().length());
			}			
		});
		
		p.add(testo);
		
		f.pack();
		f.setVisible(true);
	}

}