code: public ModifyImageAttributeRequest withUserGroups(String... userGroups) {
          if (this.userGroups == null) {
              setUserGroups(new com.amazonaws.internal.SdkInternalList<String>(userGroups.length));
          }
          for (String ele : userGroups) {
              this.userGroups.add(ele);
          }
          return this;
      }
docs: <p>
  The user groups. This parameter can be used only when the <code>Attribute</code> parameter is
  <code>launchPermission</code>.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUserGroups(java.util.Collection)} or {@link #withUserGroups(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param userGroups
  The user groups. This parameter can be used only when the <code>Attribute</code> parameter is
  <code>launchPermission</code>.
  @return Returns a reference to this object so that method calls can be chained together.