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Hendré Louw  
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 More options Feb 9 2012, 4:31 am
From: Hendré Louw <hen...@lot24media.co.za>
Date: Thu, 9 Feb 2012 11:31:23 +0200
Local: Thurs, Feb 9 2012 4:31 am
Subject: Static Variable
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After defining a object as a static variable can I change one of the
object's variables?

eg.

public static Person p = new Person();

later

p.setName("Hendre");


 
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Len Weincier  
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 More options Feb 9 2012, 4:37 am
From: Len Weincier <l...@guruhut.com>
Date: Thu, 9 Feb 2012 11:37:32 +0200
Local: Thurs, Feb 9 2012 4:37 am
Subject: Re: [CTJUG Forum] Static Variable
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Hi

Yes you can.

The more complete example is :

class SomeClass {

        public static Person p = new Person();

}

Then somewhere else you can say :

        SomeClass.p.setName("Hendre");

hth
Len

On 09 Feb 2012, at 11:31 AM, Hendré Louw wrote:


 
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Etienne Pretorius  
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 More options Feb 9 2012, 4:37 am
From: Etienne Pretorius <icewolfhun...@gmail.com>
Date: Thu, 9 Feb 2012 11:37:36 +0200
Local: Thurs, Feb 9 2012 4:37 am
Subject: Re: [CTJUG Forum] Static Variable
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Hello Hendre,

You should be able to change the values inside the class - provided the 'p' variable is within static scope. You are applying your access modifiers only on the reference and not to the class.

Kind Regards,
Etienne

On 09 Feb 2012, at 11:31 AM, Hendré Louw wrote:


 
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Ewald Horn  
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 More options Feb 9 2012, 4:39 am
From: Ewald Horn <ewaldh...@gmail.com>
Date: Thu, 9 Feb 2012 11:39:40 +0200
Local: Thurs, Feb 9 2012 4:39 am
Subject: Re: [CTJUG Forum] Static Variable
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Hi.

Yes, the static is not the same as in C++ - it simply means that the SAME
variable will be shared across instances of the class.

It can still be modified, just like a normal instance variable.

Best regards,
Ewald

On 9 February 2012 11:31, Hendré Louw <hen...@lot24media.co.za> wrote:


 
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Paul Gilowey (Santam)  
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 More options Feb 9 2012, 4:43 am
From: "Paul Gilowey (Santam)" <Paul.Gilo...@santam.co.za>
Date: Thu, 9 Feb 2012 09:43:55 +0000
Local: Thurs, Feb 9 2012 4:43 am
Subject: RE: [CTJUG Forum] Static Variable
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Hey Hendre,

Take care that you really need the variable to be static (see Ewald's reply).
Thread safety can be an issue in a multi-threaded environment.

Regards
Paul.

From: ctjug-forum@googlegroups.com [mailto:ctjug-forum@googlegroups.com] On Behalf Of Etienne Pretorius
Sent: 09 February 2012 11:38 AM
To: ctjug-forum@googlegroups.com
Subject: Re: [CTJUG Forum] Static Variable

Hello Hendre,

You should be able to change the values inside the class - provided the 'p' variable is within static scope. You are applying your access modifiers only on the reference and not to the class.

Kind Regards,
Etienne

On 09 Feb 2012, at 11:31 AM, Hendré Louw wrote:

After defining a object as a static variable can I change one of the object's variables?

eg.

public static Person p = new Person();

later

p.setName("Hendre");

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Hendré Louw  
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 More options Feb 9 2012, 4:44 am
From: Hendré Louw <hen...@lot24media.co.za>
Date: Thu, 9 Feb 2012 11:44:25 +0200
Local: Thurs, Feb 9 2012 4:44 am
Subject: Re: [CTJUG Forum] Static Variable
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Thank you this answers my question.

On Thu, Feb 9, 2012 at 11:37 AM, Etienne Pretorius
<icewolfhun...@gmail.com>wrote:


 
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Moandji Ezana  
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 More options Feb 9 2012, 6:50 am
From: Moandji Ezana <mwa...@gmail.com>
Date: Thu, 9 Feb 2012 13:50:45 +0200
Local: Thurs, Feb 9 2012 6:50 am
Subject: Re: [CTJUG Forum] Static Variable
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Also note that in this case:

class SomeClass {
 public static Person p = new Person();

}

You can also do:

SomeClass.p = null;

You might consider making p final. However, globally shared mutable state
is generally a bad idea. For concurrency reaons, as Paul mentioned, but
also by creating hidden dependencies between classes, which can, for
example, make testing harder.

Moandji


 
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Hendré Louw  
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 More options Feb 9 2012, 7:07 am
From: Hendré Louw <hen...@lot24media.co.za>
Date: Thu, 9 Feb 2012 14:07:13 +0200
Local: Thurs, Feb 9 2012 7:07 am
Subject: Re: [CTJUG Forum] Static Variable
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Can i also say

SomeClass.p = new Person();


 
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Len Weincier  
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 More options Feb 9 2012, 7:23 am
From: Len Weincier <l...@guruhut.com>
Date: Thu, 9 Feb 2012 14:23:34 +0200
Local: Thurs, Feb 9 2012 7:23 am
Subject: Re: [CTJUG Forum] Static Variable
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On 09 Feb 2012, at 2:07 PM, Hendré Louw wrote:

> Can i also say

> SomeClass.p = new Person();

Yes

Len


 
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Munaf Sheikh  
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 More options Feb 9 2012, 7:25 am
From: Munaf Sheikh <munaf.she...@gmail.com>
Date: Thu, 9 Feb 2012 14:25:54 +0200
Local: Thurs, Feb 9 2012 7:25 am
Subject: Re: [CTJUG Forum] Static Variable
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Can i also say

> SomeClass.p = new Person();

yes. you can do anything you want to it. anything.

<http://jobs.gamatam.com/>


 
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Hendré Louw  
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 More options Feb 9 2012, 7:33 am
From: Hendré Louw <hen...@lot24media.co.za>
Date: Thu, 9 Feb 2012 14:33:56 +0200
Local: Thurs, Feb 9 2012 7:33 am
Subject: Re: [CTJUG Forum] Static Variable
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When I add final to the statement can I call p.setName("Hendre");

public static final Person p = new Person();


 
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Etienne Pretorius  
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 More options Feb 9 2012, 7:36 am
From: Etienne Pretorius <icewolfhun...@gmail.com>
Date: Thu, 9 Feb 2012 14:36:00 +0200
Subject: Re: [CTJUG Forum] Static Variable
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On 09 Feb 2012, at 2:33 PM, Hendré Louw wrote:

> When I add final to the statement can I call p.setName("Hendre");

Yes, because you are not making the instance final - you are making the reference variable final.

Kind Regards,
Etienne Pretorius


 
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Hendré Louw  
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 More options Feb 9 2012, 7:44 am
From: Hendré Louw <hen...@lot24media.co.za>
Date: Thu, 9 Feb 2012 14:44:40 +0200
Local: Thurs, Feb 9 2012 7:44 am
Subject: Re: [CTJUG Forum] Static Variable
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Fantastic! static and final works on the reference and not the instance.

How do this relate to primitive types?

Can i do the following

public static int TEMP_VALUE = -1;

then later do the following

TEMP_VALUE = 2;

or in the case of final

public final static int TEMP_VALUE = -1;

then later do the following

TEMP_VALUE = 2;

On Thu, Feb 9, 2012 at 2:36 PM, Etienne Pretorius
<icewolfhun...@gmail.com>wrote:


 
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Munaf Sheikh  
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 More options Feb 9 2012, 7:47 am
From: Munaf Sheikh <munaf.she...@gmail.com>
Date: Thu, 9 Feb 2012 14:47:43 +0200
Local: Thurs, Feb 9 2012 7:47 am
Subject: Re: [CTJUG Forum] Static Variable
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static; yes,
Final: no  (compiler will complain)

On 9 February 2012 14:44, Hendré Louw <hen...@lot24media.co.za> wrote:


 
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Etienne Pretorius  
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 More options Feb 9 2012, 7:48 am
From: Etienne Pretorius <icewolfhun...@gmail.com>
Date: Thu, 9 Feb 2012 14:48:56 +0200
Local: Thurs, Feb 9 2012 7:48 am
Subject: Re: [CTJUG Forum] Static Variable
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On 09 Feb 2012, at 2:44 PM, Hendré Louw wrote:

> Fantastic! static and final works on the reference and not the instance.

> How do this relate to primitive types?

> Can i do the following

> public static int TEMP_VALUE = -1;

Since these a non-objects, they will act the same as the reference in the previous examples.

Static = Class variable
Final = non-mutable;

Kind Regards,
Etienne Pretorius


 
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