@Manish Well Explained:) @sulekha Probably you have to read Head First java which is an awesome book that covers these topics with examples
On 12 March 2013 21:10, manish untwal <[email protected]> wrote: > according to my understanding the super class object have limited function > like for example > Class - animal : methods/behavior : roam() and eat() > and a sub class hippo : method/behavior : roam(),eat() and swim() > so a hippo is a animal then according to the polymorphic property of java > a reference of animal can refer to object of class hippo and animal but > still the reference can call only the behavior of class animal i.e : animal > A = new hippo() is legal but you can't call A.swim() because it refer to > the animal property of class hippo ie roam and eat...not swim. and also u > can't do this as hippo H = new animal() as this means animal should have > all the property of hippo because it is referred by a hippo reference do > H.swim() should not be a NULL.....reply if you get it or not. > P.S : I tried to explain it through an example > > On Tue, Mar 12, 2013 at 8:51 PM, sulekha metta <[email protected]>wrote: > >> what ever data members,member functions present in super class are >> applicable to subclass...subclass may contain more additional >> features....so its obvious that size of subclass object is more than >> superclass object...now lets take an analogy of float(4 bytes) and double( >> 8 bytes) float can be implicitly converted into double( as float size is >> less when compared to double) but not vice versa....then why is this not >> applicable to superclass object and subclass object(as size of superclass >> object is less when compared to subclass)? please tell if am wrong! >> >> >> On Tue, Mar 12, 2013 at 7:37 PM, subramony mahadevan <[email protected] >> > wrote: >> >>> i think its just a logical reason .... take animal as superclass bird as >>> subclass ... since we are talking about inheritance it is " is a >>> relationship " ie bird is a animal not vice versa hence we cannot >>> implicitly convert to subclass >>> >>> >>> On Sat, Mar 2, 2013 at 6:18 PM, sulekha metta >>> <[email protected]>wrote: >>> >>>> Q) why super class object can't be implicitly converted to subclass? >>>> is there any specific reason? >>>> Thanks in advance! >>>> >>>> -- >>>> sulekha metta >>>> B.E computer science >>>> osmania university >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Algorithm Geeks" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> For more options, visit https://groups.google.com/groups/opt_out. >>>> >>>> >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Algorithm Geeks" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >>> >> >> >> >> -- >> sulekha metta >> B.E computer science >> osmania university >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > > > -- > With regards, > Manish kumar untwal > Indian Institute of Information Technology > Allahabad (2009-2013 batch) > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
