public UpdateKxUserRequest withUserName(String userName) {
        setUserName(userName);
        return this;
    }
<p>
A unique identifier for the user.
</p>

@param userName
       A unique identifier for the user.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-finspace/src/main/java/com/amazonaws/services/finspace/model/UpdateKxUserRequest.java