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Offline Sanxion

Junior Member




Java games rock!


« Posted 2003-08-30 21:46:54 »

I need to:
1) retrieve values using keys
2) be able to iterate the contents in the order they were inserted.

I can't find this functionality in any of the Maps. Have I missed one or I must I make my own? If thats the case, how to make it speedy for get and iteration.
Offline tom
« Reply #1 - Posted 2003-08-30 22:31:31 »

Don't believe there exist a Map that does exactly this. I would suggest you make your own class using a Hastable for 1) and a Vector for 2).

The other option would be to use a SortedMap where you use your own Comparable interface. But I guess you would have to bake in a insertion id in the key.

Online kevglass

JGO Kernel


Medals: 164
Projects: 23
Exp: 18 years


Coder, Trainee Pixel Artist, Game Reviewer


« Reply #2 - Posted 2003-08-31 05:46:42 »

You could always wrap a list and a map into one object. It might save you worrying about implemenation and you could rely on the exiting collections for performance.

Kev

Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline Sanxion

Junior Member




Java games rock!


« Reply #3 - Posted 2003-08-31 08:09:34 »

Would using two Arrays be a good idea?

String [] keys;
Object [] values;

I don't need to modify its contents beyond initialization of the program.
Offline NVaidya

Junior Member




Java games rock!


« Reply #4 - Posted 2003-08-31 08:14:50 »


If you haven't already examined it, check out
java.util.LinkedHashMap. I've found it very useful
on specific occassions.


Gravity Sucks !
Offline Sanxion

Junior Member




Java games rock!


« Reply #5 - Posted 2003-09-01 10:36:45 »

LinkedHashMap worked perfectly. I wonder if a I would gain anything by implementing my own thing based on Arrays? Isn't Arrays the most effiecient way to iterate objects?
Offline troggan

Junior Member




no guts no glory


« Reply #6 - Posted 2003-09-01 11:54:46 »

You could gain a little bit speed with implementing that. but i don't think it's worth the work Wink.

Never forget: write first, profile, fix all things that are too slow.

Don't try to optimize before profiling Cheesy.

troggan

(http://www.wannawork.de) - Will work for food
(http://tvbrowser.org) - Java EPG
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