Protected members in a superclass inaccessible by indirect subclass in Java

Question

Why is it that in Java, a superclass' protected members are inaccessible by an indirect subclass in a different package? I know that a direct subclass in a different package can access the superclass' protected members. I thought any subclass can access its inherited protected members.

EDIT

Sorry novice mistake, subclasses can access an indirect superclasses' protected members.

Solution

Perhaps you're a little confused.

Here's my quick demo and shows an indirect subclass accessing a protected attribute:

// A.java
package a;
public class A {
    protected int a;
}

// B.java 
package b;   //<-- intermediate subclass
import a.A;
public class B extends A {
}

// C.java
package c; //<-- different package 
import b.B;
public class C extends B  { // <-- C is an indirect sub class of A 
    void testIt(){
        a++;
        System.out.println( this.a );//<-- Inherited from class A
    }
    public static void main( String [] args ) {
        C c = new C();
        c.testIt();
    }
}

it prints 1

As you see, the attribute a is accessible from subclass C.

If you show us the code you're trying we can figure out where your confusion is.

Comments

[Jon Skeet]

It would be easier to see what you mean if you could give a concrete example.

[Oskar Kjellin]

He means that in assembly a1 there is a class a. This class has a protected member. However, he cannot access the protected member from class b that extends a in assembly a2, I think.

[danben]

No, he means that he cannot access the protected member from class c in a2 that extends class b that extends class a.

[Jay]

What do you mean by an "indirect subclass"? Do you mean a child of a child? Or what?

[MSumulong]

Sorry I cannot post the code due to its sensitive nature. But Oscar was right it was an forgotten import declaration.

[MSumulong]

@Jay, yes a child of a child.

[OscarRyz]

@MSumlong: I guess it right!!! :) I had the same error while creating the sample code in my answer, but since it was so small I figure out immediately. :)

[OscarRyz]

Let me guess, you should've forgotten a import declaration, as in: import b.B

[Random]

That would be quite difficult since most compilers will complain that the extened class doesn't exist.

[Erick Robertson]

OP seems to have figured it out.