The `addAll` method in the JavaFX `ObservableList` interface is used to add multiple elements to the end of the list in a single operation. It takes a collection of elements as an argument and adds all the elements from the collection to the list in the order they are returned by the collection's iterator. This method is useful when you want to add a large number of elements to the list at once, as it avoids the overhead of multiple individual additions. The method also triggers any necessary change notifications, ensuring that any listeners registered to the list are notified of the changes.
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