Import times vary-explain this to me please

Question

Why is it that when I’m importing a CD to iTunes (this is with either a new CD or an old CD) the import times vary so drastically?

Answer 1

2. It displays the objects on the stage. (It displays them one by one in the order in which they
were dragged to the stage from the Library when you designed the game in the FLA.)what does he mean by saying display them on the stage?? because i cant see them without addchild method and he said the swf file display them??!!!!!!!!
are you using pure AS3 or are you using the design tool in CS4/5
when using the design tool in CS4/5 you can have objects in the library and drag them to the stage. this will automatically at the objects to the stage without having to call addChild()
if you are using pure AS3 you don't have access to this and you have to explicity add all you objects using addChild
Here’s the issue: if the class’s constructor method includes a reference to the stage or an object that
is on the stage that hasn’t yet been displayed, you’ll get an error message saying this: here i cant understand any single word!!
Error #1009: Cannot access a property or method of a null object reference.
you would only need to add a reference to the stage for non DisplayObjects (e.g. generally things that aren't sprites or MovieClips)
All DisplayObjects have access to the stage via the stage property. The stage property for an object is always null until you call addChild, not when they are constructed as you mention.
if you are trying to use the stageWidth and stageHeight property you shouldn't do this in the constructor of the object instead you would need to add an Event.ADDED_TO_STAGE listener and then do any configuration based ont he stage within this listener.
hope that clears it up a little