code: public java.util.List<CacheSubnetGroup> getCacheSubnetGroups() {
          if (cacheSubnetGroups == null) {
              cacheSubnetGroups = new com.amazonaws.internal.SdkInternalList<CacheSubnetGroup>();
          }
          return cacheSubnetGroups;
      }
docs: <p>
  A list of cache subnet groups. Each element in the list contains detailed information about one group.
  </p>
  
  @return A list of cache subnet groups. Each element in the list contains detailed information about one group.