Name: el35337 Date: 01/17/97

This extends the scope of bug 4023931 and explains its cause.
Javac, as well the virtual machine, allows a subclass D of C in a package pd
to inherit the package-private attributes and methods of a public class C of
another package pc. This violates encapsulation. The bug already existed in
JDK 1.02.

Symptom. Within package pd, and especially within the class D itself,
references to those inherited attributes or methods are not allowed (except
if they are redefined in D). But within package pc this is allowed. Example:
suppose the int attribute att and the int method m() have been defined with
default access in class C of package pc and are not redefined in subclass D
of package pd. The following code :

package pc;
import pd.D;

public class Main{
        public static main(String[] argv){
        D obj = new D();
        System.out.println(obj.att);
        System.out.println(obj.m());
        System.out.println(((C)obj).att);
        System.out.println(((C)obj).m());}

is sucessfully compiled (jdk 1.02 and JDK 1.1 beta2) because obj.att and
obj.m() are considered as legal references to an attribute and a field of D,
as from package pc the inherited attribute and method are visible. This
violates encapsulation. Only ((C)obj).att and ((C)obj).m should be
acceptable references in this case.

       Dyade ###@###.###

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