增加平均星数

src/com/hellogithub/service/projectService.java

@@ -153,7 +153,7 @@ public class projectService {
 
         if(commentEntityList.size() != 0)
         {
-            int sum = 0;
+            double sum = 0;
             for(int i= 0;i<commentEntityList.size();i++)
             {
                 sum +=commentEntityList.get(i).getStar();