打包准备修复bug

src/main/java/com/example/mathsystemtogether/ExamController.java

@@ -140,11 +140,6 @@ public class ExamController {
             registerStage.setTitle("数学考试系统 - 用户注册");
             registerStage.setScene(scene);
             registerStage.setResizable(false);
-            
-            // 设置父窗口引用
-            RegisterController registerController = loader.getController();
-            registerController.setParentStage((Stage) registerButton.getScene().getWindow());
-            
             registerStage.show();
 
         } catch (Exception e) {

src/main/java/com/example/mathsystemtogether/RegisterController.java

@@ -47,9 +47,6 @@ public class RegisterController {
     // 邮件服务
     private EmailService emailService;
 
-    // 父窗口引用
-    private Stage parentStage;
-
     @FXML
     public void initialize() {
         setupLevelComboBox();
@@ -64,14 +61,6 @@ public class RegisterController {
         }
     }
 
-    /**
-     * 设置父窗口引用
-     * @param parentStage 父窗口
-     */
-    public void setParentStage(Stage parentStage) {
-        this.parentStage = parentStage;
-    }
-
     private void setupLevelComboBox() {
         ObservableList<String> levels = FXCollections.observableArrayList("小学", "初中", "高中");
         levelComboBox.setItems(levels);
@@ -215,12 +204,7 @@ public class RegisterController {
             Stage currentStage = (Stage) backToLoginButton.getScene().getWindow();
             currentStage.close();
             
-            // 如果有父窗口，则关闭父窗口
+            // 打开登录界面
-            if (parentStage != null) {
-                parentStage.close();
-            }
-            
-            // 打开新的登录界面
             FXMLLoader loader = new FXMLLoader(getClass().getResource("exam-view.fxml"));
             Scene scene = new Scene(loader.load(), 900, 900);
             Stage loginStage = new Stage();