public void setArn(String arn) {
        this.arn = arn;
    }
<p>
The ARN (Amazon Resource Name) of the rule group.
</p>

@param arn
       The ARN (Amazon Resource Name) of the rule group.
aws-java-sdk-route53resolver/src/main/java/com/amazonaws/services/route53resolver/model/FirewallRuleGroup.java