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Objects themselves do not have

Phillipe Rodrigues
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Joined: Oct 30, 2007
Posts: 165
Objects themselves do not have any accessibility modifiers, only the object references do.

please explain the above.....


Thanks,
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 39409
    
  28
You can of course not gain access to the objects directly, only through references like,
private MyClass myObject;
protected YourClass yourObject;
etc.
Raghavan Muthu
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Joined: Apr 20, 2006
Posts: 3344

Well objects are like persons in your class and access modifiers are like some specialties to the properties of objects. Say, take a name having # of vowels etc but person being an object itself, it may not possess these.

Of course, how do you get access to a person? Through his roll number in a class --- nothing but a reference (more like a pointer) that knows how to reach an object!

Now when it comes to 'access modifiers' -- a means to control the access, references are also members of a class in which it is declared. so they are very well eligible to hold those.

The example what Campbell gave explains you very clearly.


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fred rosenberger
lowercase baba
Bartender

Joined: Oct 02, 2003
Posts: 11417
    
  16

Bert Bates and Kathy Sierra have come up with what I think is a pretty good analogy. Think of the object as a TV, and a reference as a remote control. you never touch the TV itself, only the remote. you use that to access the functions of the TV.


There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
Raghavan Muthu
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Joined: Apr 20, 2006
Posts: 3344

Yes, of course! Thank you fred!

That's one of the beautiful and undeniable examples!
[ April 10, 2008: Message edited by: Raghavan Muthu ]
 
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