implements

[Anonymous]

Hi!
Is always necessary overriding alls methods of interface when it is implemented.
Thank you in advance.

[Jose Botella]

Yes it is. Unless your parent class provides implementations. In this case they will be inherited an it is not necessary.
As an exception there are some methods declared optional in the interfaces in java.util.Collection and Map
By the way Jordi, if you know Spanish there are some pages in http://usuarios.tripod.es/JoseBotella
with articles about the Java Virtual Machine and the constant poool. In the future I will be adding more articles on Collections/Map and inner classes.
There is as well a simple class file parser, there is an English version of this.

[md ali]

Yes it is always necessary to provide the implementation for method if you implement an interface. The only case your are not required to do is to declare your class as an abstract class.
Regards
Muhammad Ali

[Anonymous]

Hi all,
I was wondering whether a class that neither implements some of the methods in an interface nor inherits the same (the methods) from its superclass, will be treated an abstact class by default or do we have to specify it explicitly.
It'd be great if someone could clarify.
Thanks in advance
Shyam
[This message has been edited by Shyamsundar Gururaj (edited September 07, 2001).]

[leena rane]

I was wondering whether a class that neither implements some of the methods in an interface nor inherits the same (the methods) from its superclass, will be treated an abstact class by default or do we have to specify it explicitly.

A class MUST(else compiler error) be declared as abstract if:
1.it has even 1 method which is abstract
or
2.it extends from an abstract class but does not give implementation for all abstract method.
or
3.it implement an interface but does not give implementation for for all methods.
Hope this helps,
correct me if i am wrong

[Anonymous]

Thanks Leena