prateeknigamk

i am creating chat server in php where i need to get dynamic data in php page without referesh can anyone guide me how to do it

please tell me under what condition we should we use abstract classes and main difference between interface and abstract classes

u could consider vararg methods

why it is use full to resolve overridden method at runtime rather than compile time

i am new in java can any one please tell me the main use of constructor if we can use method in what cases its necessary to use constuctor