As we use Collections.sort(list) for Collection but can we able to use that in the case of map like by implementing Comparable and Comparator? Or we can just do iterator over a Map in java?
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An important feature of a list is that there is an order to the elements, whereas within a Map there is no such order. Therefore it doesn't make sense to sort a Map. If order is important to you, you really should be using a list.