public void setVersionNumber(Long versionNumber) {
        this.versionNumber = versionNumber;
    }
<p>
The version number for the dashboard. If a version number isn't passed, the latest published dashboard version is
described.
</p>

@param versionNumber
       The version number for the dashboard. If a version number isn't passed, the latest published dashboard
       version is described.
aws-java-sdk-quicksight/src/main/java/com/amazonaws/services/quicksight/model/DescribeDashboardDefinitionRequest.java