public CreateExtensionAssociationResult withArn(String arn) {
        setArn(arn);
        return this;
    }
<p>
The system-generated Amazon Resource Name (ARN) for the extension.
</p>

@param arn
       The system-generated Amazon Resource Name (ARN) for the extension.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-appconfig/src/main/java/com/amazonaws/services/appconfig/model/CreateExtensionAssociationResult.java