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    <p><img src="https://i.stack.imgur.com/vbDcD.png" alt="enter image description here"></p> <pre><code>import java.awt.*; import java.awt.event.*; import java.util.List; import java.util.Arrays; import javax.swing.*; import javax.swing.table.*; public class TableHeaderHeightTest { private static int HEADER_HEIGHT = 32; private JTable makeTable() { JTable table = new JTable(new DefaultTableModel(2, 20)); table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); return table; } public JComponent makeUI() { JPanel p = new JPanel(new GridLayout(2,1)); JTable table1 = makeTable(); //Bad: &gt;&gt;&gt;&gt; JTableHeader header = table1.getTableHeader(); //Dimension d = header.getPreferredSize(); //d.height = HEADER_HEIGHT; //header.setPreferredSize(d); //addColumn case test header.setPreferredSize(new Dimension(100, HEADER_HEIGHT)); p.add(makeTitledPanel("Bad: JTableHeader#setPreferredSize(...)", new JScrollPane(table1))); //&lt;&lt;&lt;&lt; JTable table2 = makeTable(); JScrollPane scroll = new JScrollPane(table2); scroll.setColumnHeader(new JViewport() { @Override public Dimension getPreferredSize() { Dimension d = super.getPreferredSize(); d.height = HEADER_HEIGHT; return d; } }); // //or // table2.setTableHeader(new JTableHeader(table2.getColumnModel()) { // @Override public Dimension getPreferredSize() { // Dimension d = super.getPreferredSize(); // d.height = HEADER_HEIGHT; // return d; // } // }); p.add(makeTitledPanel("Override getPreferredSize()", scroll)); final List&lt;JTable&gt; list = Arrays.asList(table1, table2); JPanel panel = new JPanel(new BorderLayout()); panel.add(p); panel.add(new JButton(new AbstractAction("addColumn") { @Override public void actionPerformed(ActionEvent e) { for(JTable t: list) { t.getColumnModel().addColumn(new TableColumn()); JTableHeader h = t.getTableHeader(); Dimension d = h.getPreferredSize(); System.out.println(d); } } }), BorderLayout.SOUTH); panel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); return panel; } private static JComponent makeTitledPanel(String title, JComponent c) { JPanel p = new JPanel(new BorderLayout()); p.add(c); p.setBorder(BorderFactory.createTitledBorder(title)); return p; } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { createAndShowGUI(); } }); } public static void createAndShowGUI() { JFrame f = new JFrame(); f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); f.getContentPane().add(new TableHeaderHeightTest().makeUI()); f.setSize(320, 320); f.setLocationRelativeTo(null); f.setVisible(true); } } </code></pre>
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    1. POHow to change JTable header height?
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    1. USaterai
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    1. This table or related slice is empty.
    1. POHow to change JTable header height?
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    1. CO+1 wonderful example for _not_ using setXXSize :-)
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    2. COmKorbel thx :), kleopatra "not using setXXSize" that's for sure.
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    3. CO@aterai That's a nice one, really nice. I used the "bad" way before and faced with that problem you've shown above. Actually couldn't figure out what was the reason..Thanks a lot, appreciate your effort!
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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