import echopackage.ApplicationInstance; import echopackage.Button; import echopackage.Container; public class MyApplication extends ApplicationInstance { private TextField usernameField; private PasswordField passwordField; public static void main(String[] args) { new MyApplication().start(); } @Override public Window init() { Window window = new Window(); Container contentPane = new Panel(); window.setContent(contentPane); usernameField = new TextField(); passwordField = new PasswordField(); Button loginButton = new Button("Login"); loginButton.addActionListener(e -> { String username = usernameField.getText(); String password = passwordField.getText(); boolean isAuthenticated = authenticateUser(username, password); if (isAuthenticated) { // ... } else { // ... } }); contentPane.add(usernameField); contentPane.add(passwordField); contentPane.add(loginButton); return window; } private boolean authenticateUser(String username, String password) { // ... } }


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