code: public void putField(String name) throws IOException
      {
          VariableElement field = El.getField(subClass, name);
          if (field == null)
          {
              throw new IllegalArgumentException("field "+name+" not found");
          }
          putField(field);
      }
docs: Set field in this class
  <p>Stack: ..., value =&gt; ...
  @param name
  @throws IOException