### Question:
DateValue extends Value { @Override Value unequal (Value v) { return new BooleanValue (!mDate.equals (v.toDateValue ().mDate)); } DateValue(Calendar date);   DateValue(String stringValue); @Override String toString();  }### Answer:
@Test public void testUnequal () { assertEquals ("false", mDate.unequal (mDate).toString ()); assertEquals ("true", mDate.unequal (mOtherDate).toString ()); }