public String getDomainName() {
        return this.domainName;
    }
<p>
A custom domain endpoint to associate. Specify a root domain (for example, <code>example.com</code>), a subdomain
(for example, <code>login.example.com</code> or <code>admin.login.example.com</code>), or a wildcard (for
example, <code>*.example.com</code>).
</p>

@return A custom domain endpoint to associate. Specify a root domain (for example, <code>example.com</code>), a
        subdomain (for example, <code>login.example.com</code> or <code>admin.login.example.com</code>), or a
        wildcard (for example, <code>*.example.com</code>).
aws-java-sdk-apprunner/src/main/java/com/amazonaws/services/apprunner/model/AssociateCustomDomainRequest.java