I was able to figure out the way by going through the source code of the labs and deployed the same.
AppsPropertyService service=new AppsPropertyService(applicationName);
service.setUserCredentials(adminUserName,Password);
GenericEntry entry = new GenericEntry();
entry.addProperty("oldOrgUnitPath",oldOrg);
entry.addProperty("orgUnitPath", newOrg);
service.update(new URL("https://www.google.com/a/feeds/orguser/2.0/"+cutomerId+"/"+MailIdofUserToBeMoved), entry);
customerid- is the unique key of the admin.