code: public Subnet withIpv6CidrBlockAssociationSet(SubnetIpv6CidrBlockAssociation... ipv6CidrBlockAssociationSet) {
          if (this.ipv6CidrBlockAssociationSet == null) {
              setIpv6CidrBlockAssociationSet(new com.amazonaws.internal.SdkInternalList<SubnetIpv6CidrBlockAssociation>(ipv6CidrBlockAssociationSet.length));
          }
          for (SubnetIpv6CidrBlockAssociation ele : ipv6CidrBlockAssociationSet) {
              this.ipv6CidrBlockAssociationSet.add(ele);
          }
          return this;
      }
docs: <p>
  Information about the IPv6 CIDR blocks associated with the subnet.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setIpv6CidrBlockAssociationSet(java.util.Collection)} or
  {@link #withIpv6CidrBlockAssociationSet(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param ipv6CidrBlockAssociationSet
  Information about the IPv6 CIDR blocks associated with the subnet.
  @return Returns a reference to this object so that method calls can be chained together.