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01.30.2008 at 12:00PM PST, ID: 23124097
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Does constructor usage vary depending on static instantiation?
Dear Experts,

I'm instantiating a class (Little) during the loading of another class (Big). Little has only one constructor, and it is not empty.  Somehow, Little was being instantiated during the load of Big without Little's constructor being called.

How could that happen?

One big clue: when I changed the declaration of Little within Big to static, the constructor was called.

Why?

Why? Why? Why?

--BrianMc1958
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Question Stats
Zone: Programming
Question Asked By: BrianMc1958
Solution Provided By: sunray_2003
Participating Experts: 1
Solution Grade: A
Views: 0
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01.30.2008 at 01:59PM PST, ID: 20781863

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01.30.2008 at 02:18PM PST, ID: 20782038

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01.30.2008 at 02:19PM PST, ID: 20782045

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01.30.2008 at 03:04PM PST, ID: 20782472

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01.31.2008 at 05:56AM PST, ID: 20786479

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01.30.2008 at 01:59PM PST, ID: 20781863
Can you give us your sample code to see what is going on..
 
01.30.2008 at 02:18PM PST, ID: 20782038
This is the  "Little" constructor:


And this is the instantiation of Little:

private static Little little = new Little();

(Never posted with EE "Code Snippet" before.  Let's see how it looks!)
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	Little()
	{
		dashBoard = new MyGenericTextFileWriter(dashboardRelativeName, true);
		System.out.println("dash instantiation");
	}
 
	
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01.30.2008 at 02:19PM PST, ID: 20782045
Didn't know how to "snippet" two snippets above.  What's in the box is the constructor, of course.
 
01.30.2008 at 03:04PM PST, ID: 20782472
In your class big, when you declare the varaible litte as static, little gets loaded into memory when class Big gets loaded into memory. So little's constructor is called.
But when the variable little in class big is non-static, little will get loaded when you create an object for Big.Big big = new Big() will run little's constructor.
Accepted Solution
 
01.31.2008 at 05:56AM PST, ID: 20786479
Wow.  I can't believe I've never been tripped up by that before.  It makes sense.  Thanks for the explanation.

--BrianMc1958
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628