Java Swing - JTable中的多个列标题？

Question

Is there any way to create multiple column headers in a JTable ? I mean, normally there is only one row, but I need two of them with the same format (headerlike), and combine some cells of one of those headers.

I need something like this:

Header0 |          Header123          | Header4
Header0 | Header1 | Header2 | Header3 | Header4

Is there any way?

Answer 1

Nick Meyer thanks for kindly reply, while the content in your address is a little out of date. i run it with jre 1.7 and it didn't works as expected but it can be altered to work correct. the alter i made are as follow

/*
* add these code in GroupableTableHeader
*/

  public void updateUI(){
//      setUI(this.getUI());

      TableCellRenderer renderer = getDefaultRenderer();
      if (renderer instanceof Component) {
          SwingUtilities.updateComponentTreeUI((Component)renderer);
      }
  }

/*
* add these code in GroupableTableHeaderUI in 2 places, you must know where
*/
      if (renderer == null) {
          renderer = header.getDefaultRenderer();
      }

/*
* change the getSize method in ColumnGroup 
*/

  public Dimension getSize(JTable table) {
    Component comp = renderer.getTableCellRendererComponent(
        table, getHeaderValue(), false, false,-1, -1);
    int height = comp.getPreferredSize().height; 
    int width  = 0;
    Enumeration en = v.elements();
    while (en.hasMoreElements()) {
      Object obj = en.nextElement();
      if (obj instanceof TableColumn) {
        TableColumn aColumn = (TableColumn)obj;
        width += aColumn.getWidth();
//        width += margin;
      } else {
        width += ((ColumnGroup)obj).getSize(table).width;
      }
    }
    return new Dimension(width, height);
  }

and the finally results.

Answer 2

Groupable Header示例是一些可能能够帮助您的旧代码。

Answer 3

you can extend BasicTableHeaderUI and write your own implementation of paint method, in which you can draw any type of header. after this change default header UI with following command table.getTableHeader().setUI(MyTableHeaderUI)