About class and object relationship : <p>Can I say that class is a manual for building up an object?</p>

<p>I agreed that object is one of the instance of class.But if some properties that defined by classes may not make sense for particular object, for example,I have an object called "Duck" which use the class "Bird" for build, but Duck cannot fly,so if I use class "Bird" for build up an object "Duck".In the other words, the manual cannot provided the guideline for build up the object.</p>

<p>So,can i say that class is a manual for building up an object?As well as the manual should provided all the functions that the users need,in case there shouldn 't have any defects inside. </p>
