add comment, reward, total

Change-Id: Ib3d9f5f11b51e4bbf4dc5a553315ff3fd9110efb
diff --git a/src/main/java/com/g9/g9backend/pojo/Comment.java b/src/main/java/com/g9/g9backend/pojo/Comment.java
index eddc42b..1f6e74f 100644
--- a/src/main/java/com/g9/g9backend/pojo/Comment.java
+++ b/src/main/java/com/g9/g9backend/pojo/Comment.java
@@ -21,13 +21,13 @@
 
     private int userId;
 
-    private int threadId;
+    private Integer threadId;
 
-    private int resourceId;
+    private Integer resourceId;
 
-    private int rewardId;
+    private Integer rewardId;
 
-    private int replyId;
+    private Integer replyId;
 
     private String content;