latex表格居中和表格内容居中

\begin{table}
\caption{Table captions should be placed above the tables.}\label{tab1}
\begin{tabular}{|l|l|l|}
\hline
Heading level & Example & Font size and style\
\hline
Title (centered) & {\Large\bfseries Lecture Notes} & 14 point, bold\
1st-level heading & {\large\bfseries 1 Introduction} & 12 point, bold\
2nd-level heading & {\bfseries 2.1 Printing Area} & 10 point, bold\
3rd-level heading & {\bfseries Run-in Heading in Bold.} Text follows & 10 point, bold\
4th-level heading & {\itshape Lowest Level Heading.} Text follows & 10 point, italic\
\hline
\end{tabular}
\end{table}

文中居中表格

如果需要表格在文中居中，且代码中由tabular（上述代码第三行**\begin{tabular}{|l|l|l|}），则在\begin{table}** 后面添加 \centering，若table没有嵌入tabular，可以在**\begin{table}之前添加\begin{center},\end{table}之后添加\end{center}**。

居中表格标题

\begin{tabular}{|l|l|l|}
代码{}中的L(l)代表左对齐，分隔符|代表表格的边框，比如上述代码得到的表格如下

修改格式后：\begin{tabular}{|c|c|c|}

修改边框后：\begin{tabular}{c|c|c}