public class NastyAss extends JFrame {

	private static final long serialVersionUID = 1L;

	private JPanel contentPane;
	private JTextField textFieldLogin;
	private JPasswordField passwordField;

	public NastyAss() {

		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException exception) {
			exception.printStackTrace();
		}

		setTitle("Login pls");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 344, 148);
		setLocationRelativeTo(null);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);

		textFieldLogin = new JTextField();
		textFieldLogin.setBounds(85, 11, 233, 20);
		contentPane.add(textFieldLogin);
		textFieldLogin.setColumns(10);

		JLabel lblUsername = new JLabel("Username:");
		lblUsername.setBounds(10, 14, 65, 14);
		contentPane.add(lblUsername);

		JLabel lblPassword = new JLabel("Password:");
		lblPassword.setBounds(10, 45, 65, 14);
		contentPane.add(lblPassword);

		String username = "danichee";
		String password = "dendi";

		passwordField = new JPasswordField(password);
		passwordField.setBounds(85, 42, 233, 20);
		contentPane.add(passwordField);

		JButton btnLogin = new JButton("Login");
		btnLogin.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent event) {
				char[] pass = passwordField.getPassword();

				if (textFieldLogin.getText().equals(username) && isCorrect(pass)) {
					System.out.println(true);
				} else {
					System.out.println(false);
				}
			}
		});
		btnLogin.setBounds(10, 70, 308, 28);
		contentPane.add(btnLogin);
	}

	private boolean isCorrect(char[] pass) {
		boolean isCorrect = true;

		char[] password = { 'd', 'e', 'n', 'd', 'i' };

		if (pass.length != password.length) {
			isCorrect = false;
		} else {
			isCorrect = Arrays.equals(pass, password);
		}

		Arrays.fill(password, '0');

		return isCorrect;
	}

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					NastyAss frame = new NastyAss();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}