code: public ListUserGroupsResult withGroupList(Group... groupList) {
          if (this.groupList == null) {
              setGroupList(new java.util.ArrayList<Group>(groupList.length));
          }
          for (Group ele : groupList) {
              this.groupList.add(ele);
          }
          return this;
      }
docs: <p>
  The list of groups the user is a member of.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setGroupList(java.util.Collection)} or {@link #withGroupList(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param groupList
  The list of groups the user is a member of.
  @return Returns a reference to this object so that method calls can be chained together.