Author	Topic: final classes
jvarkha greenhorn	posted April 27, 2000 07:03 AM Hi, As far as I understand, final classes cannot be subclassed. So you cannot create an instance of Math class or make another class extend Math class. Wrapper classes (Integer,Double etc) are also final, but how come we're creating new instances of these classes using their constructors ? I definitely am missing something here. Clarifications will be welcomed. Thanks.
Robin unregistered	posted April 27, 2000 07:38 AM Hi jvarkha, final classes can't be subclassed,but they can be instantiated. Math class is static final so u won't create objects of this class but directly call its methods like Math.random() etc.
maha anna bartender	posted April 27, 2000 08:12 AM Robin, Your reason is not exactly true why we can't create objects of Math class. It is because Math class's constructor is kept private The modifier final for class comes into picture when we try to subclass the final base class. Final classes CAN NOT be subclassed. But we CAN create objects (instantiate this final class) provided the final class gives us permission by making its constructors accessible for us outsiders. (Not making it private). Also note that the members inside the final class can still access the private constructor. regds maha anna [This message has been edited by maha anna (edited April 27, 2000).]
jvarkha greenhorn	posted April 27, 2000 08:13 AM Thanks Robin, you cleared my doubt.
jvarkha greenhorn	posted April 27, 2000 08:23 AM HI Maha Anna, I missed your response, but Thanks a lot for the clarification. So the important factor here is the visibility of the constructor. Thanks.

|