\begin{tikzpicture}
\umlemptyclass{A1}
\umlemptyclass[x=4, y=1]{A2}
\umlemptyclass[x=6, y=3]{A3}

\umlHVHdep[arm1=1.5cm]{A1}{A2}
\umlHVHdep[arm1=1.5cm]{A1}{A3}
\end{tikzpicture}