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import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;
class MyKeyListener extends KeyAdapter {
public void keyTyped(KeyEvent evt) {
JTextComponent c = (JTextComponent) evt.getSource();
char ch = evt.getKeyChar();
if (Character.isLowerCase(ch) == false) {
return;
}
try {
c.getDocument().insertString(c.getCaretPosition(), "" + Character.toUpperCase(ch), null);
evt.consume();
} catch (BadLocationException e) {
}
}
}
public class Main {
public static void main(String[] argv) throws Exception {
JTextField component = new JTextField();
component.addKeyListener(new MyKeyListener());
JFrame f = new JFrame();
f.setSize(300, 300);
f.setVisible(true);
}
}
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