code: public void setDayOfWeek(com.google.api.ads.admanager.axis.v201808.DayOfWeek dayOfWeek) {
          this.dayOfWeek = dayOfWeek;
      }
docs: Sets the dayOfWeek value for this DayPart.
  
  @param dayOfWeek   * Day of the week the target applies to. This field is required.