taken from field

The sort policy specifies how sorting in this TableView should be performed. For example, a basic sort policy may just call FXCollections.sort(tableView.getItems()), whereas a more advanced sort policy may call to a database to perform the necessary sorting on the server-side.

TableView ships with a default that does precisely as mentioned above: it simply attempts to sort the items list in-place.

It is recommended that rather than override the sort method that a different sort policy be provided instead.

Since:  JavaFX 8.0