class Test {
  public static void main(String[] args){
    LinkedList<Byte> xs = new LinkedList<Byte>();
    xs.add(new Byte(0)); xs.add(new Byte(0));
    Byte x = xs.iterator().next();

    LinkedList<String> ys = new LinkedList<String>();
    ys.add("zero"); ys.add("one");
    String y = ys.iterator().next();

    LinkedList<LinkedList<String>> zss = new LinkedList<LinkedList<String>>();
    zss.add(ys);
    String z = zss.iterator().next().iterator().next();

    Byte w = ys.iterator().next(); // compile-error!
  }
}