我怎样才能有一个JTable的列和行都有标题？像这样的东西：+------+------+------+------+|/\/\/\| col1 | col2 | col3 |+------+------+------+------+| row1 | | | |+------+------+------+------+| row2 | | | |+------+------+------+------+| row3 | | | |+------+------+------+------+谢谢
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