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Offline Sanxion

Junior Devvie

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.

Offline kevglass

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« 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.


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Offline Sanxion

Junior Devvie

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 Devvie

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 Devvie

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 Devvie

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.


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