public UpdateExtensionAssociationResult withExtensionVersionNumber(Integer extensionVersionNumber) {
        setExtensionVersionNumber(extensionVersionNumber);
        return this;
    }
<p>
The version number for the extension defined in the association.
</p>

@param extensionVersionNumber
       The version number for the extension defined in the association.
@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/UpdateExtensionAssociationResult.java