public void setArn(String arn) {
        this.arn = arn;
    }
<p>
The Amazon Resource Name (ARN) that identifies the objective.
</p>

@param arn
       The Amazon Resource Name (ARN) that identifies the objective.
aws-java-sdk-controlcatalog/src/main/java/com/amazonaws/services/controlcatalog/model/ObjectiveSummary.java