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    <p>Try this little example.</p> <p><img src="https://i.stack.imgur.com/RLcug.png" alt="Sorted 1st column"></p> <h2>The better way</h2> <p>As suggested by Kleopatra, defining a column class relevant for each, will be enough to get the data to be sorted correctly.</p> <pre><code>import javax.swing.*; import javax.swing.table.*; import java.util.Comparator; class TableSorting { public static void main(String[] args) { Object[][] data = { {new Integer(1), "Don't Let Go", new Integer(179)}, {new Integer(2), "Photograph", new Integer(29)}, {new Integer(3), "Hash Pipe", new Integer(186)}, {new Integer(4), "Island In The Sun", new Integer(200)}, {new Integer(5), "Crab", new Integer(154)}, {new Integer(6), "Knock-Down Drag-Out", new Integer(128)}, {new Integer(7), "Smile", new Integer(158)}, {new Integer(8), "Simple Pages", new Integer(176)}, {new Integer(9), "Glorious Day", new Integer(160)}, {new Integer(10), "O Girlfriend", new Integer(230)} }; Object[] columns = {"Track #", "Title", "Length"}; DefaultTableModel model = new DefaultTableModel(data,columns) { @Override public Class getColumnClass(int column) { switch (column) { case 0: return Integer.class; case 1: return String.class; case 2: return Integer.class; default: return String.class; } } }; JTable table = new JTable(model); JScrollPane scroll = new JScrollPane(table); table.setAutoCreateRowSorter(true); JOptionPane.showMessageDialog(null, scroll); } } </code></pre> <h2>Original, using a comparator</h2> <pre><code>import javax.swing.*; import javax.swing.table.*; import java.util.Comparator; class TableSorting { public static void main(String[] args) { Object[][] data = { {new Integer(1), "Don't Let Go", new Integer(179)}, {new Integer(2), "Photograph", new Integer(29)}, {new Integer(3), "Hash Pipe", new Integer(186)}, {new Integer(4), "Island In The Sun", new Integer(200)}, {new Integer(5), "Crab", new Integer(154)}, {new Integer(6), "Knock-Down Drag-Out", new Integer(128)}, {new Integer(7), "Smile", new Integer(158)}, {new Integer(8), "Simple Pages", new Integer(176)}, {new Integer(9), "Glorious Day", new Integer(160)}, {new Integer(10), "O Girlfriend", new Integer(230)} }; Object[] columns = {"Track #", "Title", "Length"}; JTable table = new JTable(data, columns); JScrollPane scroll = new JScrollPane(table); DefaultTableModel model = new DefaultTableModel(data,columns); TableRowSorter trs = new TableRowSorter(model); class IntComparator implements Comparator { public int compare(Object o1, Object o2) { Integer int1 = (Integer)o1; Integer int2 = (Integer)o2; return int1.compareTo(int2); } public boolean equals(Object o2) { return this.equals(o2); } } trs.setComparator(0, new IntComparator()); table.setRowSorter(trs); scroll = new JScrollPane(table); table.setAutoCreateRowSorter(false); JOptionPane.showMessageDialog(null, scroll); } } </code></pre>
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    1. POWhy does my JTable sort an integer column incorrectly?
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    1. COnice to use an optionPane as top-level container in an example :-)
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    2. COYes, but it's probably even nicer to wrap GUI calls in a Runnable and invoke it later. I'm not sure if my defense is 'batteries not included' or '(shrugs) I was just too lazy'. ;)
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    3. COhave seen it - could refrain from mentioning it, with effort, hehe
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