public void setArn(String arn) {
        this.arn = arn;
    }
<p>
Displays the key ARN of a primary or replica key of a multi-Region key.
</p>

@param arn
       Displays the key ARN of a primary or replica key of a multi-Region key.
aws-java-sdk-kms/src/main/java/com/amazonaws/services/kms/model/MultiRegionKey.java