Code:
import javax.swing;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class TextFieldExample {

    JPanel textPanel, panelForTextFields, completionPanel;
    JLabel titleLabel, usernameLabel, passwordLabel, userLabel, passLabel;
    JTextField usernameField, loginField;
    JButton loginButton;

    public JPanel createContentPane
...