@Override
   public boolean contains(Object o) {
      if (!(o instanceof Integer))
         return false;
      int i = (int) o;
      return contains(i);
   }
@Test
   public void contains1() throws Exception {
      RangeSet rs = new RangeSet(4);
      assertFalse(rs.contains(Integer.valueOf(5)));
      assertTrue(rs.contains(Integer.valueOf(1)));
   }