Thinking in Java 4th edition - help with inner class exercise

"cy" <>
9 Apr 2007 19:39:13 -0700
Trying to solve this exercise: (Chapter Innerclasses, Exercise 6,
page 353)
Create an interface with at least one method, in its own package.
 a class in a separate package. Add a protected inner class that
 implements the interface. In a third package, inherit from your class
 inside a method, return an object of the protected inner class,
 to the interface during the return.

The following solution compiles and runs, but I had to use a public
method to instantiate the protected class in the 2nd package. Is
there a solution using the protected class directly? Shouldn't a
child class have access to protected members, including inner class
members, of parent class from another package.

/* // in first package:
* public interface Ex6Interface {
* String say();
* }
* // and in second package:
* public class Ex6Base {
* protected class Ex6BaseInner implements Ex6Interface {
* public String say() { return "Hi"; }
* }
* public Ex6BaseInner getEx6BaseInner() {
* return new Ex6BaseInner();
* }
* }
// in third package:
import innerclasses.ex6Interface.*;
import innerclasses.ex6Base.*;

public class Ex6 extends Ex6Base {
    private Ex6Base e6b;
    Ex6() {
        e6b = new Ex6Base();
    Ex6Interface getBaseInner() {
        // Error: Ex6BaseInner has protected access:
        // return Ex6BaseInner();
        // to create protected class use public method:
        return e6b.getEx6BaseInner();
    public static void main(String[] args) {
        Ex6 ex = new Ex6();
        // Error: Ex6BaseInner has protected access:
        // Ex6Base.Ex6BaseInner ebi = Ex6BaseInner();
        // new Ex6Base().new Ex6BaseInner();


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