public java.util.List<String> getUserGroups() {
        if (userGroups == null) {
            userGroups = new com.amazonaws.internal.SdkInternalList<String>();
        }
        return userGroups;
    }
<p>
The user groups. This parameter is valid only when modifying the <code>loadPermission</code> attribute.
</p>

@return The user groups. This parameter is valid only when modifying the <code>loadPermission</code> attribute.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/ModifyFpgaImageAttributeRequest.java