If in doubt, check out the AS3 docs. :)
var urlList : Vector.<String> = new <String>["str1", "str2", "str3"]; trace(urlList);
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/Vector.html#Vector ()
A direct quote from a line that I adapted in the documentation:
To create a pre-populated Vector instance, use the following syntax instead of using the options listed below:
// var v:Vector.<T> = new <T>[E0, ..., En-1 ,]; // For example: var v:Vector.<int> = new <int>[0,1,2,];
user562566
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