public String getCertificateIdentifier() {
        return this.certificateIdentifier;
    }
<p>
The user-supplied certificate identifier. If this parameter is specified, information for only the identified
certificate is returned. This parameter isn't case-sensitive.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
Must match an existing CertificateIdentifier.
</p>
</li>
</ul>

@return The user-supplied certificate identifier. If this parameter is specified, information for only the
        identified certificate is returned. This parameter isn't case-sensitive.</p>
        <p>
        Constraints:
        </p>
        <ul>
        <li>
        <p>
        Must match an existing CertificateIdentifier.
        </p>
        </li>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/DescribeCertificatesRequest.java