code: public DescribeCacheSubnetGroupsResult withCacheSubnetGroups(CacheSubnetGroup... cacheSubnetGroups) {
          if (this.cacheSubnetGroups == null) {
              setCacheSubnetGroups(new com.amazonaws.internal.SdkInternalList<CacheSubnetGroup>(cacheSubnetGroups.length));
          }
          for (CacheSubnetGroup ele : cacheSubnetGroups) {
              this.cacheSubnetGroups.add(ele);
          }
          return this;
      }
docs: <p>
  A list of cache subnet groups. Each element in the list contains detailed information about one group.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setCacheSubnetGroups(java.util.Collection)} or {@link #withCacheSubnetGroups(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param cacheSubnetGroups
  A list of cache subnet groups. Each element in the list contains detailed information about one group.
  @return Returns a reference to this object so that method calls can be chained together.