Wtf with maps??? 0_o

code part:

Map<String,PropertyType> SelectedItems = new Map<String,PropertyType>();

for(oneProperty oneProp : DisplaiedProperties)
{           System.Debug('_____________________'+oneProp.PropertyValue+'_______________'+oneProp.PType);
SelectedItems.put(oneProp.PropertyValue,oneProp.PType);
}


for(string b:SelectedItems.keySet())
{
System.Debug('_____________________'+b+'_______________'+SelectedItems.get(b));
}

and part of debug log:

How can i simply walk throught the Map in right direction???

July 30, 2010
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dnakoni
Here's a line from Apex Documentation:

Do not rely on the order in which map results are returned. The order of objects returned by maps may change without warning. Always access map elements by key.

http://www.salesforce.com/us/developer/docs/apexcode/index.htm

Does that help?

July 30, 2010
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Dan_Gru
I'am realy confused by this. I mean that opportunitiy to direct walking throught data set(any data set) is the one of the basiс requirement of hi-level programming language. :smileysad:

In this way construction is nearly to be unuseful. mde=(

July 30, 2010
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bob_buzzard
You can walk through the data set, you just can't walk through the data set in any order (e.g. the order that you added them). If you need ordering, I'd suggest that you maintain a seperate list of Strings containing the keys from the map. As the list is ordered, you can then iterate the list to retrieve the keys in the order you added them, and then lookup the value associated with the key in the map.

July 30, 2010
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runger
It is possible (in a general algorithmic sense, not in apex) to have a sorted map, where an iterator over the map will iterate in an order derived by comparing the keys. This would require a different type of data structure than the common hashtable, which is what apex uses as its map implementation. An example of this is Java's TreeMap. The trouble with sorted maps is that there is a performance penalty to pay. TreeMap insertions are not done in constant time, for example. This could have serious impact on apex programs that create maps from large query result sets.

At any rate, it is highly common for maps in any language to not have the property of being sorted.

Rich

July 30, 2010
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