Creating multi-line header for JTable

Question

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));

Never mind, I updated my answer again :) Check if it looks as expected now. — Peter Lang, Feb 27 '10 at 09:06

score 5 · Accepted Answer · edited Jun 22 '19 at 16:08

5

Try the following:

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

This will change the size of the header:

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

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

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.

edited Jun 22 '19 at 16:08

Glorfindel

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answered Feb 26 '10 at 17:50

Peter Lang

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Great, thanx that's what I need. However, I am now having quite trouble center text in header ... Is there any chance you know how to? – miso Feb 26 '10 at 18:16
html tag wont help ... SwingConstants.CENTER would, but I would againg need to create own renderer for headers :/ – miso Feb 26 '10 at 18:20
I tried `center` and it worked: `"Long
Header"`. Have you tried like this? – Peter Lang Feb 26 '10 at 18:57
headers[0] = "Monday
"+week[0]+""; Does not work for me :/ My headers are resizable btw – miso Feb 26 '10 at 19:02
Peter you helped me once again, I am thankful :) It is correct as you suggest ((JLabel)table.getTableHeader().getDefaultRenderer()).setHorizontalAlignment(SwingConstants.CENTER); solves it – miso Feb 27 '10 at 13:56

score 1 · Answer 2 · answered Jul 31 '12 at 15:28

hi guys i tried this and it works:

    DefaultTableCellRenderer r;

    String headers[] = new String[3];
    headers[0] = "Category";
    headers[1] = "Item";
    headers[2] = "<html><center>Packaging<br>unit</center></br></html>";
    DefaultTableModel dtm = new DefaultTableModel();
    table.setModel(dtm);
    r = (DefaultTableCellRenderer)table.getTableHeader().getDefaultRenderer();
    r.setHorizontalAlignment(JLabel.CENTER);
    dtm.setColumnIdentifiers(headers);

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

Creating multi-line header for JTable

2 Answers2

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