Java JTextField Add Key Listener Event Handler

Chapter: Swing Last Updated: 01-10-2016 17:18:15 UTC

Program:

            /* ............... START ............... */
                
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 JavaJTextFieldKeyListner extends JFrame {

	public JavaJTextFieldKeyListner() 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 JavaJTextFieldKeyListner().setVisible(true);
	}
}
                /* ............... END ............... */
        

Output


Java JTextField Add Key Listener Event Handler

Tags

JTextField Add Key Listener Event Handler, Swing, Java

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