\documentclass[a4paper, oneside, 10pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage[czech]{babel}
\usepackage{listings}
\begin{document}



\lstset{frame=single, language=java}
\begin{lstlisting}

/**
 * The HelloWorldApp class implements an application that
 * simply displays "Hello World!" to the standard output.
 */
class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!"); //Display the string.
    }
}
\end{lstlisting}

\lstset{frame=single, language=pascal}
\begin{lstlisting}

for i:=maxint to 0 do
begin
{ do nothing }
end;
Write('Case insensitive');
Write('Pascal keywords.');
\end{lstlisting}



\lstset{frame=single, language=PHP}
\begin{lstlisting}

echo "Hello, Dokuwiki!";
\end{lstlisting}

\lstset{frame=single, language=PHP}
\begin{lstlisting}

echo "Hello again, Dokuwiki!;
\end{lstlisting}



\lstset{frame=single, language=HTML}
\begin{lstlisting}

I am <strong>strong</strong>
\end{lstlisting}

\lstset{frame=single, language=HTML}
\begin{lstlisting}

I am <strong>stronger</strong>
\end{lstlisting}

\lstset{frame=single, language=php, title=myexample.php}
\begin{lstlisting}

<?php echo "hello world!"; ?>
\end{lstlisting}

\lstset{frame=single, language=php, title=myexample.php}
\begin{lstlisting}

<?php echo "hello world!"; ?>
\end{lstlisting}



\end{document}