public java.util.List<String> getUsernameAttributes() {
        return usernameAttributes;
    }
<p>
Specifies whether a user can use an email address or phone number as a username when they sign up.
</p>

@return Specifies whether a user can use an email address or phone number as a username when they sign up.
@see UsernameAttributeType
aws-java-sdk-cognitoidp/src/main/java/com/amazonaws/services/cognitoidp/model/CreateUserPoolRequest.java