创建一个包含 2 列和 2 个子列的表格

Question

我正在尝试创建下表：

我尝试过以下但

    \begin{table}[htb]
  \centering
  \caption{Caption}
  \label{tab:example}
  \begin{tabular}{*6c}
    \toprule
    \multicolumn{2}{c}{B}  & \multicolumn{2}{c}{A}  \\ 
    \cmidrule(r){1-2} 
    Class & Number           & Class & Number      \\ 
    \cmidrule(r){1-2} 
    \bottomrule
  \end{tabular}
\end{table}

Answer 1

编辑： 考虑到 OP 评论说表格宽度应等于\textwidth。为此使用tabularx表格环境：

使用makecell（for\Xhline{...}和makegapedcells）和tabularx包：

\documentclass{article}
\usepackage{makecell, tabularx}

\begin{document}
    \begin{table}[htb]
    \centering
    \setcellgapes{4pt}
    \makegapedcells
\caption{Caption}
\label{tab:example}
    \begin{tabularx}{\linewidth}{|*{4}{>{\centering\arraybackslash}X|} }
    \Xhline{1.2pt}
    \multicolumn{2}{|c|}{A} & \multicolumn{2}{c|}{B}  \\
    \Xhline{0.8pt}
    Class       & Number    & Class     & Number    \\  \hline
                &           &           &           \\  \hline
                &           &           &           \\
    \Xhline{1.2pt}
  \end{tabularx}
\end{table}
\end{document}

或不使用垂直线并使用包装 booktabs：

\documentclass{article}
\usepackage{booktabs, tabularx}

\begin{document}
    \begin{table}[htb]
    \centering
\caption{Caption}
\label{tab:example}
    \begin{tabularx}{\linewidth}{ *{4}{>{\centering\arraybackslash}X} }
    \toprule
    \multicolumn{2}{c}{A} & \multicolumn{2}{c}{B}  \\
    \cmidrule(r){1-2}
    \cmidrule(l){3-4}
    Class       & Number    & Class     & Number    \\
    \midrule   
     aaa        & bbb       & ccc       & ddd       \\  
     aaa        & bbb       & ccc       & ddd       \\
    \bottomrule
  \end{tabularx}
\end{table}
\end{document}