Update an Email Message
Marketing Cloud has a new model for storing, finding, managing, creating, sharing, and distributing all content-related objects. Access the objects created with the new Content Builder tools using the REST API. Your existing SOAP API integrations only function with the Classic tools in the user interface.
Use the Patch method to update an existing email message. Specify a unique identifier in the props property in order to identify which email will be updated:
Documentation for the Fuel Java SDK can be found at http://salesforce-marketingcloud.github.io/FuelSDK-Java/