How can we use SortedMap Interface for sorting a Map?

Question

I have UnsortedMap<String, CustomObject>. Here key, though of String type stores numeric values.

Though there are many ways to sort a Map but i want to do sorting using SortedMap interface.

Is there any way to achieve this. Any help will be appreciated

Answer 1

See SortedMap, specifically All Known Implementing Classes.

Using TreeMap is probably not bad in your case:

SortedMap<String,CustomObject> map = new TreeMap<String,CustomObject>();
map.putAll( yourUnsortedMap );

On a side note, if you know your keys to be numeric, why not have the Map be of erasure <Integer,CustomObject> instead?

Cheers,