code: public boolean isSet(_Fields field) {
      if (field == null) {
        throw new IllegalArgumentException();
      }
  
      switch (field) {
      case HANDLE:
        return isSetHandle();
      case NAME:
        return isSetName();
      case USER_ID:
        return isSetUserId();
      case POOL_INFO:
        return isSetPoolInfo();
      case PRIORITY:
        return isSetPriority();
      case DEADLINE:
        return isSetDeadline();
      case RUNNING_RESOURCES:
        return isSetRunningResources();
      }
      throw new IllegalStateException();
    }
docs: Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise