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