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import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.HeadlessException;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class Main extends JFrame {
public Main() throws HeadlessException {
setSize(200, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout(FlowLayout.LEFT));
JLabel usernameLabel = new JLabel("Username: ");
JTextField usernameTextField = new JTextField();
usernameTextField.setPreferredSize(new Dimension(100, 20));
add(usernameLabel);
add(usernameTextField);
usernameTextField.addKeyListener(new KeyAdapter() {
public void keyReleased(KeyEvent e) {
JTextField textField = (JTextField) e.getSource();
String text = textField.getText();
textField.setText(text.toUpperCase());
}
public void keyTyped(KeyEvent e) {
}
public void keyPressed(KeyEvent e) {
}
});
}
public static void main(String[] args) {
new Main().setVisible(true);
}
}
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