Re: Inner class and interface question (I posted some really long code)

From:
Daniel Pitts <newsgroup.nospam@virtualinfinity.net>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 27 Dec 2011 23:27:35 -0800
Message-ID:
<IxzKq.47710$cN1.2696@newsfe12.iad>
On 12/27/11 10:29 PM, Chad wrote:

I'm want to put the getHead() method in the BagInterface. However, I
can't do this because the compiler keeps saying it can't find 'class
Node' in Location BagInterface<T>. I guess this is because Node is an
inner class of my LinkedList class. Ideas how to fix this? Ideally I
want to preserve the inner class. Below is the complete working code
in question.

public class Main {

     public static void main(String[] args) {
         BagInterface<Integer> list = new LinkedList<Integer>();
         list.add(new Integer(1));
         list.add(new Integer(2));
         list.add(new Integer(100));
         list.add(new Integer(100));
         list.add(new Integer(100));
         list.add(new Integer(100));
         list.add(new Integer(99));
         list.add(new Integer(11));
         list.printMe();
         //System.out.println("The sum is " +
list.sumMe(list.getHead()));

     }//end main
}

interface BagInterface<T> {
     public void add(T newData);
     public void printMe();
     public Node getHead(); //<---Problem Line

}


[snip]
Node is specific to LinkedList, and doesn't belong in Bag. As a matter
of fact, "getHead()" doesn't make sense in Bag at all, and on top of
that, exposing "Node" out of a collection class seems to me to be a very
bad leaking of encapsulation

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