[3504] in java-interest
Re: protected is not?
daemon@ATHENA.MIT.EDU (David Geary)
Tue Nov 14 21:50:37 1995
Date: Tue, 14 Nov 1995 17:24:48 -0700
From: David.Geary@Central.Sun.COM (David Geary)
To: daconta@PrimeNet.Com, edith@pencom.com
Cc: java-interest@java.Eng.Sun.COM
> Hi,
>
> protected variables can be accessed by the methods of its class and subclasses
OK.
> apiece is an object of junk so apiece can access protected variable name.
> Change name to a private variable if you want name to be accessed only by
> the junk class.
But it's being accessed in a method that is not in Junk or one of it's
subclasses. (See your first statement).
If the (Java) code below does not contain a bug, then protected in Java
means something quite different than protected in C++. Consider:
#include "iostream.h"
class junk
{
protected: int x;
};
class Protect
{
doit() { junk aJunk; cerr << aJunk.x; }
}
int main()
{
Protect p;
p.doit();
}
rmtc >> CC tst.C
"tst.C", line 10: Error: x is not accessible from Protect::doit().
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
David Geary "In the backwater swirling
geary@rmtc.Central.Sun.COM there is something that'll never change"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Here is a simple chunk of code that does not
> > seem to work properly.
> >
> > class junk {
> > protected String name;
> >
> > junk(String inName)
> > {
> > name = new String(inName);
> > }
> > }
> >
> > class Protect {
> > public static void main(String args[])
> > {
> > junk apiece = new junk("piece of junk");
> >
> > System.out.println(apiece.name);
> > }
> > }
> >
> >
> > This code compiles and prints out the name of the
> > object. The problem is that the compiler should not have
> > let me do this. name is a protected variable. protected should
> > mean that inaccesible except to subclasses.
> >
> > Any ideas or is this a bug?
> >
> > I am using the beta for Win95.
> >
> > - Mike Daconta
> >
> > -
> > This message was sent to the java-interest mailing list
> > Info: send 'help' to java-interest-request@java.sun.com
> ==============================================================================
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> WWW Specialist Email: edith@pencom.com
> Pencom Systems Incorporated WWW: http://www.pencomsi.com/~edith
> 40 Fulton Street,
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