Doesn't the Java SDK support the functionality of 'aws s3 sync'?

I attempted to synchronize the bucket using "software.amazon.awssdk.transfer.s3.model.DirectoryDownload" and "software.amazon.awssdk.transfer.s3.model.DirectoryUpload" but it seems to serve only the purpose of simple overwriting. However, looking at the result messages after using the "aws s3 sync" command, it appears that identical files are not overwritten. I'm curious if there are any plans to incorporate the sync functionality of the CLI or if I can implement it within the functionality provided by the SDK. Thank you.