code: private static String getTypeInfo(List<Object> list) {
  
          StringBuilder s = new StringBuilder();
          for (Object o : list) {
              if (s.length() > 0)
                  s.append(", ");
              if (o == null)
                  s.append("null");
              else {
                  s.append(o.getClass().getName());
                  s.append("=");
                  s.append(o);
              }
          }
          return s.toString();
      }
docs: Returns debugging info about the types of a list of objects.
  
  @param list
  @return