How do I drag and drop a row in a JTable?

Question

How do you setup a JTable to be able to drag a row to a different index in the table. For example if I have 5 rows and I want to drag the 4th row to the 2nd position?

Answer 1

Just for the records and multiple row re-ordering:

use somewhere....

 JTable table = t_objects;
    table.setDragEnabled(true);
    table.setDropMode(DropMode.INSERT_ROWS);
    table.setTransferHandler(new TableRowTransferHandler(table));

This is the main class in the above answer, I modified that to match the needs for multiple row DnD. All I did was to use the first selected row, then calculate the rows above the drop place. Removed seleced items and keep them in a list of objects (row array object). then insert them back to calculated row. and finally select the removed/dragged rows to complete the process.

public class TableRowTransferHandler extends TransferHandler {

    private final DataFlavor localObjectFlavor = new DataFlavor(Integer.class, "Integer Row Index");
    private JTable table = null;

    public TableRowTransferHandler(JTable table) {
        this.table = table;
    }

    @Override
    protected Transferable createTransferable(JComponent c) {
        assert (c == table);
        return new DataHandler(new Integer(table.getSelectedRow()), localObjectFlavor.getMimeType());
    }

    @Override
    public boolean canImport(TransferHandler.TransferSupport info) {
        boolean b = info.getComponent() == table && info.isDrop() && info.isDataFlavorSupported(localObjectFlavor);
        table.setCursor(b ? DragSource.DefaultMoveDrop : DragSource.DefaultMoveNoDrop);
        return b;
    }

    @Override
    public int getSourceActions(JComponent c) {
        return TransferHandler.COPY_OR_MOVE;
    }

    @Override
    public boolean importData(TransferHandler.TransferSupport info) {
        JTable target = (JTable) info.getComponent();
        JTable.DropLocation dl = (JTable.DropLocation) info.getDropLocation();
        int index = dl.getRow();
        int max = table.getModel().getRowCount();
        if (index < 0 || index > max) {
            index = max;
        }
        target.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));

        try {
            Integer rowFrom = (Integer) info.getTransferable().getTransferData(localObjectFlavor);
            if (rowFrom != -1 && rowFrom != index) {

                int[] rows = table.getSelectedRows();
                int dist = 0;
                for (int row : rows) {
                    if (index > row) {
                        dist++;
                    }
                }
                index -= dist;

                //**TableUtil** is a simple class that just copy, remove and select rows.

                ArrayList