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Editorial Team
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Asked: 2026-05-13T20:06:56+00:00

I use JTable GUI component with NetBeans. I want to create multi-line headers I

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I use JTable GUI component with NetBeans.

  • I want to create multi-line headers

  • I am able to this, when I create custom renderer for table headers

  • BUT I don’t want to, because I like default one (I use it everywhere else in program).

  • So the problem is : How to make
    header heigher?

My code :

String headers[] = new String[3];
    headers[0] = "Header1";
    headers[1] = "Header2";
    headers[2] = "<html><center>Long<br>Centered</br></center></html>";
    DefaultTableModel dtm = new DefaultTableModel();
    dtm.setColumnIdentifiers(headers);
    dtm.setRowCount(5);
    jTable1.setModel(dtm);
    jTable1.getTableHeader().setPreferredSize(
                new Dimension(jTable1.getColumnModel().getTotalColumnWidth(),32));
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1 Answer

  1. Editorial Team

    Try the following:

    table.getTableHeader().setPreferredSize(
      new Dimension(table.getColumnModel().getTotalColumnWidth(), 32));

    This will change the size of the header:

    alt text

    To center the text, you can use the <center>-tag:

    headers[2] = "<html><center>Long Centered<br>Header";

    alt text

    EDIT:

    The alignment is set by your LookAndFeel. WindowsTableHeaderUI for example explicitly calls

    setHorizontalAlignment(LEADING);

    The easiest way to solve this is:

    (JLabel)table.getTableHeader().getDefaultRenderer())
      .setHorizontalAlignment(SwingConstants.CENTER);

    Note that this change is lost when you change your LookAndFeel afterwards.

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