Re: Different treatment of the NodeType of LinkedList in C++ and Java

From:
Lew <noone@lewscanon.com>
Newsgroups:
comp.lang.c++,comp.lang.java.programmer
Date:
Thu, 29 Oct 2009 08:47:31 -0400
Message-ID:
<hcc2t4$tcb$1@news.albasani.net>
James Kanze wrote:

Package access is less protective than protected access in C++
(or in Java). With protected access, the only way to access the
name is to derive from the class. With package access, you can
either derive from the class, or declare another class as a
member of the same package.


That is not correct for Java; in fact, it's exactly backwards.

In Java, "package-private", or default access means only accessible from
within the same package, as the word implies. 'protected' access is a
superset of that; members are available to subclasses even in different
packages, as well as to classes in the same package. A class cannot access
package-private members of one of its superclasses in a different package.

<http://java.sun.com/docs/books/tutorial/java/javaOO/accesscontrol.html>

That chart does not make clear that package-private members can be inherited
by a subclass in the same package, but it's so. (It's not so for private
members, not even for extending inner classes.)

--
Lew

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