Re: a question for sorting keys in Map
www wrote:
Hi,
I have a Map, actually a TreeMap, which will automatically sort the keys
alphabetically. The keys are Strings, like "VARIABLE" + i, e.g:
VARIABLE0, VARIABLE1, VARIABLE2, etc.
If the total number of entries < 10, then the sorted order is ok:
VARIABLE0
VARIABLE1
VARIABLE2
But, if the total number of entries > 10, the sorted order is not what I
want:
VARIABLE0
VARIABLE1
VARIABLE10
VARIABLE11
VARIABLE12
...
VARIABLE2
VARIABLE20
VARIABLE21
...
VARIABLE3
VARIABLE30
VARIABLE31
...
I want the order be:
VARIABLE0
VARIABLE1
VARIABLE2
...
VARIABLE9
VARIABLE10
VARIABLE11
....
Can you help me to achieve this? Thank you very much.
I suggest not using a map of Strings in this case:
SortedMap<Integer, Something>;
Or, using a List
List<Something>
If you absolutely must using Strings, then tell me this:
Which order would these strings be in? A1B10, B2A9
Regardless of your answer there, you'll need to write a
Comparator<String> implementation that will give the correct ordering.
Hope this helps,
Daniel.
--
Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>
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