package mathlearning; import mathlearning.service.UserService; import mathlearning.ui.LoginFrame; import javax.swing.*; public class App { public static void main(String[] args) { // 设置UI风格 try { UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName()); } catch (Exception e) { e.printStackTrace(); } // 启动应用程序 SwingUtilities.invokeLater(() -> { UserService userService = new UserService(); LoginFrame loginFrame = new LoginFrame(userService); loginFrame.setVisible(true); }); } }