code: public List<URL> getURLs() {
          final List<URL> resourceURLs = new ArrayList<>(this.size());
          for (final Resource resource : this) {
              resourceURLs.add(resource.getURL());
          }
          return resourceURLs;
      }
docs: Get the URLs of all resources in this list, by calling {@link Resource#getURL()} for each item in the list.
  
  @return The URLs of all resources in this list.