public void setArn(String arn) {
        this.arn = arn;
    }
<p>
The ARN of the custom identifier that was used to detect the sensitive data.
</p>

@param arn
       The ARN of the custom identifier that was used to detect the sensitive data.
aws-java-sdk-securityhub/src/main/java/com/amazonaws/services/securityhub/model/CustomDataIdentifiersDetections.java