Remote scripting using a servlet

public class RSExample extends RemoteScriptingServlet {
    public static String getSubcategories (String catstr) throws Exception
    {
      // sure, there is a possibility of an exception happening here, but
      // RemoteScriptingServlet will catch it and deal with it appropriately

      int catid = Integer.parseInt(catstr);

      String subcats[][] = new String[][] {
         new String[] {"Category 0 - Subcategory 0", "Category 0 - Subcategory 1", "Category 0 - Subcategory 2"},
         new String[] {"Category 1 - Subcategory 0", "Category 1 - Subcategory 1", "Category 1 - Subcategory 2"},
         new String[] {"Category 2 - Subcategory 0", "Category 2 - Subcategory 1", "Category 2 - Subcategory 2"},
      };

      String retval = "";
      for (int i = 0; i < subcats[catid].length; i++) {
        // build a string with "index,value" pairs separated by semicolons
        // for demo brevity, we'll assume that no commas or semicolons are present
        // in the values of subcats[catid][i]
        retval += i + "," + subcats[catid][i] + ";";
      }

      return retval;
    }
}