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    <p>Starting from this <a href="https://stackoverflow.com/a/8260663/230513">example</a>, I saw no unexpected behavior with the <code>getColumnClass()</code> implementation shown below.</p> <pre><code>private Model() { final Object[] data = {this.toString()}; this.model = new DefaultTableModel(data, 1){ @Override public Class&lt;?&gt; getColumnClass(int columnIndex) { System.out.println(data[0]); return super.getColumnClass(columnIndex); } }; model.addRow(data); } </code></pre> <p>Note that <code>JTable</code> may invoke <code>getColumnClass()</code> anytime it determines that a cell needs rendering. If necessary, you can use <code>EventQueue.invokeLater()</code> to schedule something that will "happen after all pending events are processed."</p> <pre><code>EventQueue.invokeLater(new Runnable() { @Override public void run() { // do something } }); </code></pre> <p>Addenda:</p> <ul> <li><p>If <code>getAutoCreateRowSorter()</code> is <code>true</code>, <code>setModel()</code> tries to restore the <code>RowSorter</code> created using the old model. </p></li> <li><p>You can specify <code>setAutoCreateRowSorter(true)</code> <em>after</em> you change models, as shown below, or extend your <code>TableModel</code> to update the model in place, as shown <a href="https://stackoverflow.com/a/11241218/230513">here</a>.</p></li> <li><p>Use <code>ActionListener</code> for <code>JButton</code> instead of <code>MouseListener</code>.</p></li> <li><p>Use a <code>TableCellEditor</code> for buttons in the table, as shown <a href="https://stackoverflow.com/a/5556631/230513">here</a> and <a href="https://stackoverflow.com/a/5559747/230513">here</a>.</p></li> </ul> <p>Code:</p> <pre><code>addButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (table.getModel().getRowCount() == 2) { return; } Object[][] data = new Object[table.getModel().getRowCount() + 1][5]; table.setRowSorter(null); for (int i = 0; i &lt;= table.getModel().getRowCount(); i++) { data[i][0] = i; data[i][6] = "User" + i; data[i][7] = "Delete"; } table.setModel(new CustModel(data)); table.setAutoCreateRowSorter(true); } }); </code></pre>
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    1. COHi Trashgod, I have check with example which you suggested. If you just debug the same example(to view object ids) you can see, as you change dropdown value, `setModel()` first calls `getColumnClass()` function from old object and at second time it calles from new model object. And thats my problem. I just want to call `getColumnClass()` function only with new model object only.
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    2. CO@Navnath [you can to hardocde getColumnClass](http://stackoverflow.com/a/6233119/714968)
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    3. CO@mKorbel There is nothing to do with `getColumnClass()`. It's all about, functions from model class getting called twice when I set new model to table by using `setModel()` function. mKorbel, Thanks that you are following this thread, Please suggest me something.
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