There is a bug in AbstractList in private class Itr

method : hasNext()

public boolean hasNext() {
            return cursor != size();
}

------------------
It should be:
return cursor < size();

Below is some sample code that exercises the problem.

I create a List with 2 elements and remove the second element.
When I step into hasNext() in a debugger
cursor == 2 and size == 1

Thus hasNext() should return false. It obviously is supposed to return true if the cursor is less than the size. It returns true -- even though it does not "has Next".

Granted -- the code is terrible. It removes an item from the list instead of removing it from the iterator. But it was nevertheless introduced into production code.
Just changing "!=" to "<" will make AbstractList more robust.

package quickie;
import java.util.*;
/**
 *
 * @author bnevins
 */
public class Main
{
    Main() {
        
    }
    public static void main(String[] args)
    {
        List<String> list = new ArrayList<String>();
        list.add("a");
        list.add("b");
        
        Iterator iter = list.iterator();
        while(iter.hasNext())
        {
            String s = (String)iter.next();
            if(s.equals("b"))
                list.remove(s);
        }
    }
   }