How to create an engine that prefixes url "http://"?

Question

I'm currently doing a project using Spring mvc and was working on my backend part.(Dealing with bookmarks) I have created a engine interface (IBookmarkEngine) and then made my implementation (BookmarkEngine). I'm just having trouble making this work. How do I create an engine that prefixes url "http://"?

 public class BookmarkEngine implements IBookmarkEngine {

     private static final String URL_PREFIX = "http://";

     @Override
     public String getFullUrl(String url) {

         if () {
             return;
         }
         return url;
     }
 }

`return URL_PREFIX + url;` ? Is it what you are looking for? — Sergei Sirik, Mar 07 '18 at 21:14
Possible duplicate of [How do I concatenate two strings in Java?](https://stackoverflow.com/questions/3753869/how-do-i-concatenate-two-strings-in-java) — Sergei Sirik, Mar 07 '18 at 21:15

score 0 · Accepted Answer · answered Mar 07 '18 at 22:21

Maybe you can add the prefix if it is not present. So in your IF statement you can do a startsWith search on the url. If the url does not start with the prefix, then add the prefix to the url.

 public class BookmarkEngine implements IBookmarkEngine {

     private static final String URL_PREFIX = "http://";

     @Override
     public String getFullUrl(String url) {

         if (!url.startsWith(URL_PREFIX)) {
             return  URL_PREFIX + url;
         }
         return url;
     }
 }

How to create an engine that prefixes url "http://"?

1 Answers1