\begin{tikzpicture}%[show background grid]
   \begin{class}[text width=7cm]{Class}{0,0}
   \attribute{+ Public}
   \attribute{\# Protected}
   \attribute{- Private}
   \attribute{$\sim$ Package}
 \end{class}

 \begin{class}[text width=7cm]{BankAccount}{0,-3}
   \attribute{+ owner : String}
   \attribute{+ balance : Dollars}

   \operation{+ deposit( amount : Dollars )}
   \operation{+ withdrawal( amount : Dollars )}
   \operation{\# updateBalance( newBalance : Dollars )}
 \end{class}
\end{tikzpicture}

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