Using multicolumn in latex

Code:

\documentclass{article}
\begin{document}
    \begin{table}
        \centering
        \caption{Multiprogram sets}
        \label{multiprogram}
        \begin{tabular}{c|c|c|c|c|c|c|c|c|}
            \cline{2-9}
             & \multicolumn{8}{|c|}{Sets}\\
            \cline{2-9}
             & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8\\
            \hline
            \multicolumn{1}{|c|}{astar} & & * &  & * &  &  & * &\\
            \hline
        \end{tabular}
    \end{table}
\end{document}

And the result: