JAVA SDK

QuickBase made the SDKs open sourced roughly four years ago, and can be accessed through the repository here: https://github.com/QuickbaseAdmirer?tab=repositories. One example for constructing your object is located here: http://help.quickbase.com/user-assistance/#resolve_scripting_issues.html where it shows:
"QuickBaseClient qc = new QuickBaseClient("testuser@intuit.com","password", "<accountURL>.quickbase.com");". It's been years since I coded in Java though, and I haven't played with which packages to import in the QuickBase world.

FYI...The Quickbase java SDK is useless and should be remove...it doesn't support any of the current token structures of quickbase and hasn't been updated in over 6 years.