Java - Collection with LinkedHashMap Attributes

Question

Is there a collection class that has the LinkedHashMap quality of a predictable iteration order, but at the same time being indexable? LinkedHashMap implements a get() method, which returns the value object, but an indexof() method is not available. I'd like both.

Thanks.

Sounds like you need a bidirectional map (key -> value, value -> key) — Jason S
– Jason S, Commented Aug 12, 2009 at 20:57

Cornelius Dol · Accepted Answer · 2009-08-19 00:57:17Z

1

I have such a thing, a Linked Tree Map free and unencumbered on my website. It sounds close to what you want.

answered Aug 19, 2009 at 0:57

Cornelius Dol

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Comments

Steve B. · Accepted Answer · 2009-08-12 19:43:48Z

0

A SortedMap (ConcurrentSkipListMap, TreeMap) has methods that will return submap views of all keys > (or <) the passed in key. So

index(key) == sortedMap.headMap(key).size();

Not likely to be terribly efficient.

answered Aug 12, 2009 at 19:43

Steve B.

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