<![CDATA[JavaRanch: Latest posts for the topic " Generics Confusion in Overriding a method"]]> http://www.coderanch.com/forums/t/24/Programmer-Certification-SCJP/Generics-Confusion-Overriding-method JForum - http://www.jforum.net Generics Confusion in Overriding a method

//GENERIC SUPERCLASS
class superc<T>{

void set(T arg){}

}



//GENERIC SUBCLASS

class subc extends superc<Number>{

void set(Object rr){}
}


On compiling above code I get foll compiler error. :-

superc.java:10: name clash: set(java.lang.Object) in subc and set(T) in
superc<java.lang.Number> have the same erasure, yet neither overrides the other
class subc extends superc<Number>{
^
1 error

CAN ANYONE HELP ??]]> http://www.coderanch.com/forums/posts/preList/450646/2005830 http://www.coderanch.com/forums/posts/preList/450646/2005830 Generics Confusion
CAN ANYONE HELP ??


First, I am assuming "foll" means "following"?

superc.java:10: name clash: set(java.lang.Object) in subc and set(T) in
superc<java.lang.Number> have the same erasure, yet neither overrides the other


The error message is pretty clear. You have two overloaded methods set(T) and set(Object). These methods are overloading -- not overriding. Yet, after type erasure (generics is compile only), the methods have the same signature.

It is not possible for two methods with the same signature, to be overloaded methods.

Henry]]> http://www.coderanch.com/forums/posts/preList/450646/2005839 http://www.coderanch.com/forums/posts/preList/450646/2005839 Generics Confusion in Overriding a method Thanks Henry for the prompt reply but I am still not getting it. How come
methods set(T) and set(Object). are overloaded methods.


Why does the following work :



class superc<T>{

void set(T arg){}

}


class subc extends superc<Number>{

void set(Number aa){}

}]]> http://www.coderanch.com/forums/posts/preList/450646/2005840 http://www.coderanch.com/forums/posts/preList/450646/2005840 Generics Confusion in Overriding a method
Is Generics Inheritance on the SCJP 5.0 exam.

Where should I study it from besides Angelika Langer. ]]> http://www.coderanch.com/forums/posts/preList/450646/2005844 http://www.coderanch.com/forums/posts/preList/450646/2005844 Generics Confusion in Overriding a method http://www.coderanch.com/forums/posts/preList/450646/2005898 http://www.coderanch.com/forums/posts/preList/450646/2005898 Generics Confusion in Overriding a method If you get more knowledge on Generics then its an advantage for you.
You can refer Sun Java Tutorial.]]> http://www.coderanch.com/forums/posts/preList/450646/2005922 http://www.coderanch.com/forums/posts/preList/450646/2005922 Generics Confusion in Overriding a method
Thanks Henry .

Finally I think I understand that its overloading and not overriding.

]]> http://www.coderanch.com/forums/posts/preList/450646/2006686 http://www.coderanch.com/forums/posts/preList/450646/2006686 Generics Confusion in Overriding a method
Soniaa Agarwal wrote:
Thanks Henry for the prompt reply but I am still not getting it. How come
methods set(T) and set(Object). are overloaded methods.


Why does the following work :



class superc<T>{

void set(T arg){}

}


class subc extends superc<Number>{

void set(Number aa){}

}


Hi Sonia,
Can you pleaseadd why did void set(Number aa){} work?]]> http://www.coderanch.com/forums/posts/preList/450646/2015715 http://www.coderanch.com/forums/posts/preList/450646/2015715