Setting width of lines in tabular

Question

Is it possible to increase the linewidth of tables like it's possible to set the linewidth in PSTricks?

Maybe you could show me how to do it on this example:

\begin{tabular}{c|c|c|c}
    \hline
    1 & 2 & 3 & 4\\
    \hline
    5 & 6 & 7 & 8\\
    \hline
\end{tabular}

Answer 1

 \setlength\arrayrulewidth{1cm}

before the table will make the lines thicker

Answer 2

with package booktabs you can use an optional argument.

\documentclass[12pt]{article}
\usepackage{booktabs}
\setlength\aboverulesep{0pt}
\setlength\belowrulesep{0pt}

\begin{document}

\begin{tabular}{c|c|c|c}\toprule[3pt]
    1 & 2 & 3 & 4\\     \midrule[2pt]
    5 & 6 & 7 & 8\\     \bottomrule[1pt]
\end{tabular}

\end{document}

the setting

\setlength\aboverulesep{0pt}
\setlength\belowrulesep{0pt}

is only for compatibilty to standard LaTeX. It is better not to use these two lines.