Java Ordered Map

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The SortedMap interface (with the implementation TreeMap) should be your friend.

The interface has the methods:

  • keySet() which returns a set of the keys in ascending order
  • values() which returns a collection of all values in the ascending order of the corresponding keys

So this interface fulfills exactly your requirements. However, the keys must have a meaningful order. Otherwise you can used the LinkedHashMap where the order is determined by the insertion order.

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