code: public DescribeSubnetGroupsRequest withSubnetGroupNames(String... subnetGroupNames) {
          if (this.subnetGroupNames == null) {
              setSubnetGroupNames(new java.util.ArrayList<String>(subnetGroupNames.length));
          }
          for (String ele : subnetGroupNames) {
              this.subnetGroupNames.add(ele);
          }
          return this;
      }
docs: <p>
  The name of the subnet group.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setSubnetGroupNames(java.util.Collection)} or {@link #withSubnetGroupNames(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param subnetGroupNames
  The name of the subnet group.
  @return Returns a reference to this object so that method calls can be chained together.