可以简洁一点，分支太多，4 条基本可以抽象出来新函数
void setLocation(String locationId, Function<String, Boolean> setFunction) {
if (locationId!=null) {
Region region = regionService.getById(locationId);
setFunction(region.getRegionName());
}
}

4 条调用如下
setLocation(shopView.getProvinceId(), showView::setProvinceDisp)
setLocation(shopView. getCityId(), showView:: setCityDisp)
....