Guava has a TreeMultimap that stores both keys and values in sorted order. However, this uses a TreeSet for the values rather than a List so it may not quite be what you want here. In that case, Guava allows you to create a Multimap that works any way you want using one of the Multimaps.
New*Multimap methods, such as Multimaps. NewListMultimap . To make one that works like you describe, you'd just write this.
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