Add or remove an entry from a List type attribute in a DynamoDB table item

I have a very simple class, with a string type primary key and List type attributes. I want to write APIS for adding and removing an item from the attribute list and saving the changes back to DDB.

The simplest solution I can think of is: - Read the list (if it exists) - If it exists, remove or add that entry from the List type attribute - Put the modified object back

Is there a cleaner/simpler way to do this via DynamoDB java API? I spent quite some time looking it up, before I posted this question here.