public String getArn() {
        return this.arn;
    }
<p>
The Amazon Resource Name (ARN) that was returned when you called CreateDirectoryRegistration.
</p>

@return The Amazon Resource Name (ARN) that was returned when you called CreateDirectoryRegistration.
aws-java-sdk-pcaconnectorad/src/main/java/com/amazonaws/services/pcaconnectorad/model/DirectoryRegistration.java