Added some javadocs to explain code function

src/main/java/com/example/clientproject/services/UserFavouriteDeleter.java

@@ -10,6 +10,10 @@ public class UserFavouriteDeleter {
     @Autowired
     JdbcTemplate jdbc;
 
+    /**
+     * Takes a userfavourite DTO and removes it from the database.
+     * @param usfDTO
+     */
     public void delete(UserFavouriteDTO usfDTO){
 
         String query = "DELETE FROM User_Shop_Links WHERE (Shop_Id = " +

src/main/java/com/example/clientproject/services/UserFavouriteSaver.java

@@ -10,6 +10,10 @@ public class UserFavouriteSaver {
     @Autowired
     JdbcTemplate jdbc;
 
+    /**
+     * Takes a user dto and saves it to the DB with jdbc
+     * @param urfDTO UserfavouriteDTO
+     */
     public void save(UserFavouriteDTO urfDTO){
 
         String query = "INSERT INTO User_Shop_Links (Shop_Id, User_Id) VALUES ("+ urfDTO.getShopId() +

src/main/java/com/example/clientproject/services/UserFavouriteToggle.java

@@ -14,6 +14,12 @@ public class UserFavouriteToggle {
     @Autowired
     JdbcTemplate jdbc;
 
+    /**
+     * Checks whether the user has already favourited a shop
+     * @param urfDTO, Userfavourite DTO
+     * @return Boolean, true if it's already favourited false if not.
+     * @throws Exception
+     */
     public boolean alreadyInDb(UserFavouriteDTO urfDTO) throws Exception{
 
         String query = "SELECT s.User_Shop_Link_Id FROM User_Shop_Links s WHERE (Shop_Id = " +

src/main/java/com/example/clientproject/web/restControllers/BusinessFavouriter.java

@@ -19,6 +19,12 @@ public class BusinessFavouriter {
         deleteFavourite = ufd;
     }
 
+
+    /**
+     *
+     * @param Submitted form, contains a UserID and ShopID
+     * @return ERROR or OK depending on whether it any errors are thrown.
+     */
     @PostMapping("/favouriteBusiness")
     public String favouriteBusiness(UserFavouriteForm uff){
         UserFavouriteDTO ufDTO = new UserFavouriteDTO(uff);

src/main/resources/static/js/favouriteBusiness.js

 function favouriteBusiness(e,shopId){
-    
+
     if(e.classList.contains("active")){
         e.classList.remove("active")
     }else{