Ayuda con MAYUSCULAS por favor
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class SoloMayusculas extends JFrame implements KeyListener
{
JTextField text;
JLabel label;
public SoloMayusculas ()
{
setTitle("Solo mayusculas");
setSize(300, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
text = new JTextField(100);
label = new JLabel("Solo Mayusculas", JLabel.CENTER);
text.addKeyListener(this);
add(text, BorderLayout.NORTH);
add(label, BorderLayout.SOUTH);
setVisible(true);
}
public void keyTyped (KeyEvent ke)
{
char letra = ke.getKeyChar();
if (letra < 'A' || letra > 'Z')
ke.consume();
}
public void keyPressed (KeyEvent ke)
{
}
public void keyReleased (KeyEvent ke)
{
}
public static void main (String[] args)
{
new SoloMayusculas();
}
}