How to connect to SharePoint Online site to upload and download files using Java and REST API

shvanisingla 

Please refer below link to learn how to connect SharePoint Online.

https://sharepoint.stackexchange.com/questions/239128/connect-to-sharepoint-online-rest-api-using-java

And for REST api reference, please go to 

https://docs.microsoft.com/en-us/sharepoint/dev/sp-add-ins/complete-basic-operations-using-sharepoint-rest-endpoints