### Question:
Genericity { public void wildcard(final List<?> list) { LOG.info(CollectionHelper.toString(list)); }  void wildcard(final List<?> list); void up(final List<? extends Number> numbers); void down(final List<? super String> list);  }### Answer:
@Test public void testWildcard() { sample.wildcard(nums); final List<?> list = Arrays.asList(1, "bascker", '?'); sample.wildcard(list); }