code: public void store(Auth token) throws IOException {
          this.auths.put(token.getUser().getId(), token);
          this.authsByUser.put(token.getUser().getUsername(), token);
  
          String filename = token.getUser().getId() + ".auth";
          File outFile = new File(this.authStoreDir, filename);
          outFile.createNewFile();
  
          ObjectOutputStream authStream = new ObjectOutputStream(new FileOutputStream(outFile));
          authStream.writeObject(token);
          authStream.flush();
          authStream.close();
      }
docs: /*
  (non-Javadoc)
  
  @see com.flickr4java.flickr.util.AuthStore#store(com.flickr4java.flickr.auth.Auth)