How to sort guava multimap? (KEY=DATE)

Question

I have a ``` Multimap multimap = ArrayListMultimap.create(); ``` from guava. I was wondering how to SORT the the Date key in the multimap. Currently, I'm doing this: ``` Iterator dateItr = multimap.keySet().iterator(); Set treeSet = new TreeSet(Collections.reverseOrder()); ``` and later I loop through the treeSet iterator. Any idea how to avoid this circumvention?

Accepted Answer

Guava team member here.

Use `TreeMultimap`, or if you need to map into `List`s, use `MultimapBuilder`:

```
return MultimapBuilder.treeKeys().arrayListValues().build()
```

How to sort guava multimap? (KEY=DATE)

Solution

Problem