Order of elements in MultiKeyMap

Question

Recently I started using Apache Commons MultiKeyMap for some of my projects and in there I can have multiple values for a value.

MultiKeyMap typePanelUnoMap = new MultiKeyMap();

I want to know whether we can preserve insertion order when using MultiKeyMap. I know that java.util.LinkedHashMap can preserve the insertion order.

Map hshmap = new LinkedHashMap()

Can I have the same functionality with MultiKeyMap?

Thanks,
Keth

Answer 1

from the javadocs

This map is implemented as a decorator of a AbstractHashedMap which enables extra behaviour to be added easily.

MultiKeyMap.decorate(new LinkedMap()) creates an ordered map.

Answer 2

Since Apache Commons Collections 4, method multiKeyMap is being used instead of method decorate.

So it should be:

MultiKeyMap<String, Object> multiKeyMap= MultiKeyMap.multiKeyMap(new LinkedMap<>());