@Test public void shouldMarkNullAsNonZero() { boolean isZero = ObjectUtil.isZero(null); assertThat(isZero).isFalse(); }
public static boolean isZero(Long number) { return number != null && number == 0; }
ObjectUtil { public static boolean isZero(Long number) { return number != null && number == 0; } }
ObjectUtil { public static boolean isZero(Long number) { return number != null && number == 0; }  }
ObjectUtil { public static boolean isZero(Long number) { return number != null && number == 0; }  static boolean isEmpty(Object o); static boolean isNotEmpty(Object o); static boolean isZero(Long number); static boolean isPositive(Long number); }
ObjectUtil { public static boolean isZero(Long number) { return number != null && number == 0; }  static boolean isEmpty(Object o); static boolean isNotEmpty(Object o); static boolean isZero(Long number); static boolean isPositive(Long number);  }