docs: public String addFile(File file, String strFileList)
      {
          String strName = file.getName();
          int iJava = strName.indexOf(".java");
          if (iJava != -1) if (iJava == strName.length() - 5)
          {
              String strParent = file.getParent();
              String strPath = file.getPath();
              strFileList += strPath + "/" + strParent;
          }
          return strFileList;
      }