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Article #4How to make a member variable of a derivation read-only?
From: Hannes Heckner
Date: Tue, 29 Feb 2000 00:00
Date: Tue, 29 Feb 2000 00:00
52 lines
2133 bytes
2133 bytes
Hi,
I tried to following example to have my member variable foo
read-only in the derivation:
public class Class1
{
/**
* The main entry point for the application.
*
* @param args Array of parameters passed to the application
* via the command line.
*/
public static void main (String[] args)
{
// TODO: Add initialization code here
Base b = new Base();
Derivation d = new Derivation();
b.doFoo();
d.doFoo();
}
}
class Base
{
protected int foo = 0;
public void doFoo()
{
System.out.println(""+foo);
}
}
class Derivation extends Base
{
final int foo = 1;
}
Unfortunately it seems that the Derivation class DOES NOT
overload foo! Therefore you will get the following output:
0
0
How can I make foo final in the derivation by OVERLOADING
foo from the Base class?
If you know a solution to this problem, please submit it to http://www.the-codebook.com/show_code.asp?ProblemId=1356
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f74b3,d86be700aa9afbe6,start X-Google-Attributes: gidf74b3,public X-Google-Thread: 10a146,d86be700aa9afbe6,start X-Google-Attributes: gid10a146,public X-Google-Thread: fbe9c,d86be700aa9afbe6,start X-Google-Attributes: gidfbe9c,public X-Google-Thread: 100145,d86be700aa9afbe6,start X-Google-Attributes: gid100145,public X-Google-Thread: 114aa0,d86be700aa9afbe6,start X-Google-Attributes: gid114aa0,public X-Google-Thread: 113ae9,d86be700aa9afbe6,start X-Google-Attributes: gid113ae9,public From: Hannes Heckner <Hannes.Heckner@munich.ixos.de> Subject: How to make a member variable of a derivation read-only? Date: 2000/02/29 Message-ID: <951828737327@munich.ixos.de> X-Deja-AN: 591303378 Organization: The-Codebook.Com Mime-Version: 1.0 Newsgroups: ibm.software.vajava.language,borland.public.jbuilder.java.language,borland.public.jbuilder.java,microsoft.public.java.visualj++,comp.lang.java.help,comp.lang.java.programmer