JTable JComboBox SetEditable不起作用

Question

I am trying to get an editable JComboBox to work within a table but, so far, no luck. Setting cbo.setEditable(true) seems to have no effect when operating within a cell within a table. Is there something I am missing? Please help.

Sample code to demonstrate the problem:

public class ComboBoxTest {

    private JFrame frame;
    private JTable table;
    private JComboBox<?> cboFrm = null;
    private JComboBox<?> cboTbl = null;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ComboBoxTest window = new ComboBoxTest();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public ComboBoxTest() {
        initialise();
    }

    /**
     * Initialise the contents of the frame.
     */
    private void initialise() {
        frame = new JFrame();
        frame.setBounds(100, 100, 455, 233);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        String[] cboData = { "tspn", "tblspn", "gram", "Kg" };

        cboFrm = new JComboBox<String>(cboData);
        cboFrm.setBounds(10, 26, 86, 20);
        cboFrm.setEditable(true);
        frame.getContentPane().add(cboFrm);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setBounds(10, 57, 414, 127);
        frame.getContentPane().add(scrollPane);

        String columnNames[] = { "Qty", "Measure", "Ingrediant" };
        // @formatter:off
        Object[][] tableData =
            {
                { 1, "Kg", "Sugar" },
                { 1, "pinch", "Salt" },
                { 2, "handfuls", "Peanuts" },
                { 1, "Litre", "Milk"}
            };
        // @formatter:on
        table = new JTable(tableData, columnNames);
        cboTbl = new JComboBox<String>(cboData);
        cboTbl.setEditable(true);
        table.getColumnModel().getColumn(1)
                .setCellEditor(new DefaultCellEditor(cboTbl));
        scrollPane.setViewportView(table);

    }

}

Answer 1

Worked fine for me with this output:

Answer 2

To answer my own question.

There seems to be a bug in the way JComboBox interacts with JTable. The workaround is to press 'enter' after the new text has been altered. Tabbing off the table JComboBox cell doesn't work which is inconsistent with the behaviour of a standard text cell.

There is a bug report dating back to 1999-2001 where it was supposedly fixed but it has again resurfaced. Refer to the following link:

http://bugs.java.com/bugdatabase/view_bug.do?bug_id=4275046