So can I used Java based SDK (jars) for creating folder in WebI with WebServices ?
With Restful web services, the answer is currently "No".
If you are referring to the DSWS Soap web services, then yes you can create a folder with this SDK.
You can also use the Platform Java SDK to create folders. The Platform Java SDK would be the most flexible if you needed to resolve some other limitation you might come across with the REST SDK