"ptm" erscheint über CodeListing

ptm
(hier fängt der Codeblock an)
 1 H i e r i s t Programmcode
(hier endet der Codeblock)
Listing 6.1: example

\documentclass[
    paper = a4,
    fontsize = 12pt,
    headinclude = true,
    % start chapters on the right side
    open = right,
    % Use twosided layout? Every chapter starts on the right side, therefore sometimes blank pages are added between chapters.
    twoside = false,
    BCOR = 10mm,
    % add lists and bibliography to table of contents
    toc = listofnumbered,
    toc = bibnumbered,
    % enumerate chapters as x.y instead of x.y.
    numbers = noendperiod
]{scrreprt}

% use some additional package, add your own below if required
\usepackage[a4paper]{geometry}
\usepackage{subcaption}
\usepackage[utf8]{inputenc}
\usepackage{pdfpages}
\usepackage[T1]{fontenc}
\usepackage{mathptmx}
\usepackage{setspace}
\setstretch{1.5}
\usepackage[nottoc,numbib, notlof]{tocbibind}
\usepackage{float}

\newcommand\frontmatter{%
    \cleardoublepage
    \pagenumbering{roman}}
\newcommand\mainmatter{%
    \cleardoublepage
    \pagenumbering{arabic}}
\newcommand\backmatter{%
    \cleardoublepage
    \pagenumbering{Roman}}

% package for code listings
\usepackage{listings}
% package providing colors (e.g. for syntax highlighting in listings)
\usepackage{xcolor}
% package for german language, change to english if required
\usepackage[ngerman]{babel}
\usepackage[german=quotes]{csquotes}
\usepackage{xpatch}
\usepackage{hyphenat}
% package to set the line spacing
\usepackage{setspace}
% package for hyperlinks (e.g., in the table of contents) and set links to same style as text
\usepackage[hidelinks]{hyperref}
% package to create acronyms
\usepackage[acronym]{glossaries}
% package for pseudocode
\usepackage[german, algochapter, linesnumbered]{algorithm2e}
% package to create diagrams
\usepackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{shapes.geometric, arrows}
\tikzset{font={\fontsize{10pt}{12}\selectfont}}

%%% additions by ACV
% Citations using APA style with biblatex
\usepackage[style=alphabetic, labelnumber, defernumbers=true, urldate=long, dateabbrev=false,backend=biber,backref=false,maxbibnames=20]{biblatex}
% Biblatex allows multiple bib-files
\addbibresource{bibliography/sources.bib}

% Tables using APA Style
\usepackage{booktabs}

% use microkerning for improved typesetting
\usepackage{microtype}

% include acronyms


% avoid bold caption for algorithms to be consistent with other captions
\SetAlCapSty{}
\SetNlSty{footnotesize}{}{}

% definitions for syntax highlighting in listings environment
% define custom colors for syntax highlighting in code listings
\definecolor{lst_comments}{rgb}{0, 0.75, 0}
\definecolor{lst_linenumbers}{rgb}{0.2, 0.2, 0.2}
\definecolor{lst_keywords}{rgb}{0, 0, 0.75}
\definecolor{lst_strings}{rgb}{0.75, 0, 0}
\definecolor{lst_background}{rgb}{0.97, 0.97, 0.97}

% define style for listings
\lstdefinestyle{msqc_style}{
    backgroundcolor=\color{lst_background},   
    commentstyle=\color{lst_comments},
    keywordstyle=\color{lst_keywords},
    stringstyle=\color{lst_strings},
    % style of the line numbers on the left side
    numberstyle=\tiny\color{lst_linenumbers},
    % use monospace font for code and set size to the size of footnotes
    basicstyle=\rmdefault\footnotesize,
    % xleftmargin=2em,
    % break long lines, if this happens it might be better to manually add a line break at an appropriate place
    breaklines = true,
    % place caption below the listing
    captionpos = b,
    % don't drop spaces to fix alignment and always convert tabs to spaces
    keepspaces = true,
    % place line numbers on the left side
    numbers = left,
    % distance between line numbers and listing
    numbersep = 5pt,
    % don't show special characters for spaces
    showspaces = false,
    % don't show special characters for spaces in strings
    showstringspaces = false,
    % don't show special characters for tabs
    showtabs = false,
    % set size of tab to 4 spaces
    tabsize = 2
}
% set style for the document
\lstset{style=msqc_style}

% set line spacing to 1.5
\onehalfspacing
\makeglossaries

\geometry{a4paper,left=45mm,right=20mm, top=30mm, bottom=3cm}

\begin{document}

    \begin{lstlisting}[language=Java]
    Hier ist Programmcode
\end{lstlisting}

\end{document}