Why make private inner class member public in Java?

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If the InnerEvenIterator class does not extend any class or implement any interface, I think it is nonsense because no other class can access any instance of it.

However, if it extends or implements any other non private class or interface, it makes sense. An example: 

interface EvenIterator {
    public boolean hasNext();
}


public class DataStructure {
    // ...

    private class InnerEvenIterator implements EvenIterator{
        // ...

        public boolean hasNext() { // Why public?
            // ...
        }
    }

    InnerEvenIterator iterator;

    public EvenIterator getIterator(){
         return iterator;
    }     

}

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