fix some api

Change-Id: I7179a115c9ed3e7d3473c1761df1bb4f2bf3711e
diff --git a/src/main/java/com/example/g8backend/service/IUserService.java b/src/main/java/com/example/g8backend/service/IUserService.java
index 1f178f8..d980543 100644
--- a/src/main/java/com/example/g8backend/service/IUserService.java
+++ b/src/main/java/com/example/g8backend/service/IUserService.java
@@ -17,6 +17,9 @@
     boolean unfollowUser(Long followerId, Long followedId);
     List<User> getFollowings(Long userId);
     List<User> getFollowers(Long userId);
+    int getFollowingsCount(Long userId);
+    int getFollowersCount(Long userId);
+    boolean isFollowing(Long currentUserId, Long targetUserId);
 
     // 私信功能
     Long sendMessage(Long senderId, Long receiverId, String content);