\documentclass[border={8mm, 0mm, 2mm, 0mm}, varwidth]{standalone}
\usepackage{minted}
\begin{document}
\begin{minipage}{6cm}
\begin{minted}[
linenos,
]{java}
if(gesteinVorhanden())
{
    fahre();
}
else
{
    setzeMarke();
}
\end{minted}
\end{minipage}
\end{document}