What does “equal” mean? (cont.)
nTo determine if they are “equal” dates, we must compare their day, month, and year.
public boolean equals (Object obj){
Require.condition(obj
instanceof
Date);
Date d =
(Date)obj;
return this.year()==d.year() &&
this.month()==d.month()
&&
this.day()==d.day();
}
// instanceof returns true if the object is
// an instance of
// the class