How to shuffle in Jtable

Question

I have a JTable which contains TableModel(all my data). The JTable has multiple rows and columns. I need to shuffle the rows randomly. I understand I can do that with

Collections.shuffle(some list from TableModel);

But I dont know how to get the list from the existing JTable which had TableModel.

on somebodies suggestion, I tried this

RowSorter<? extends TableModel> sorter = mDocListTable.getRowSorter();
    ArrayList<RowSorter.SortKey> list = new ArrayList<RowSorter.SortKey>();

    list.add(new RowSorter.SortKey(0, SortOrder.DESCENDING));

    Collections.shuffle(list);
    sorter.setSortKeys(list);

but didnt work.

Answer 1

Something like this could work?

DefaultTableModel model = (DefaultTableModel) table.getModel();
model.getDataVector().sort((Object o1, Object o2) -> Math.random() > 0.5 ? -1 : 1);
model.fireTableDataChanged();

Edit:

For Java-7 and since .sort() was not implemented until Java-8, a 2nd (and maybe more readable) option could be:

DefaultTableModel model = (DefaultTableModel) table.getModel();
Collections.shuffle(model.getDataVector());
model.fireTableDataChanged();

This cannot be reverted.