fix: 后端代码格式化

backend/src/main/java/com/openisle/service/ActivityService.java

@@ -4,53 +4,53 @@ import com.openisle.exception.NotFoundException;
 import com.openisle.model.*;
 import com.openisle.repository.ActivityRepository;
 import com.openisle.repository.UserRepository;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
-import java.util.List;
-
 @Service
 @RequiredArgsConstructor
 public class ActivityService {
-    private final ActivityRepository activityRepository;
-    private final UserRepository userRepository;
-    private final LevelService levelService;
-    private final NotificationService notificationService;
 
-    public List<Activity> list() {
-        return activityRepository.findAll();
-    }
+  private final ActivityRepository activityRepository;
+  private final UserRepository userRepository;
+  private final LevelService levelService;
+  private final NotificationService notificationService;
 
-    public Activity getByType(ActivityType type) {
-        Activity a = activityRepository.findByType(type);
-        if (a == null) throw new NotFoundException("Activity not found");
-        return a;
-    }
+  public List<Activity> list() {
+    return activityRepository.findAll();
+  }
 
-    public long countLevel1Users() {
-        int threshold = levelService.nextLevelExp(0);
-        return userRepository.countByExperienceGreaterThanEqual(threshold);
-    }
+  public Activity getByType(ActivityType type) {
+    Activity a = activityRepository.findByType(type);
+    if (a == null) throw new NotFoundException("Activity not found");
+    return a;
+  }
 
-    public void end(Activity activity) {
-        activity.setEnded(true);
-        activityRepository.save(activity);
-    }
+  public long countLevel1Users() {
+    int threshold = levelService.nextLevelExp(0);
+    return userRepository.countByExperienceGreaterThanEqual(threshold);
+  }
 
-    public long countParticipants(Activity activity) {
-        return activity.getParticipants().size();
-    }
+  public void end(Activity activity) {
+    activity.setEnded(true);
+    activityRepository.save(activity);
+  }
 
-    /**
-     * Redeem an activity for the given user.
-     *
-     * @return true if the user redeemed for the first time, false if the
-     *         information was simply updated
-     */
-    public boolean redeem(Activity activity, User user, String contact) {
-        notificationService.createActivityRedeemNotifications(user, contact);
-        boolean added = activity.getParticipants().add(user);
-        activityRepository.save(activity);
-        return added;
-    }
+  public long countParticipants(Activity activity) {
+    return activity.getParticipants().size();
+  }
+
+  /**
+   * Redeem an activity for the given user.
+   *
+   * @return true if the user redeemed for the first time, false if the
+   *         information was simply updated
+   */
+  public boolean redeem(Activity activity, User user, String contact) {
+    notificationService.createActivityRedeemNotifications(user, contact);
+    boolean added = activity.getParticipants().add(user);
+    activityRepository.save(activity);
+    return added;
+  }
 }