returning type when we overriding methods

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Hello .
I am reading a book by Katherine Sierra and Bert Bates the is a statement i read but i didn't understood it :

In a method with an object reference return type, you can return any
object type that can be implicitly cast to the declared return type.

can anyone explain to me this statement.

Posted 21-Nov-11 22:32pm

hamzah1

Updated 22-Nov-11 0:14am

Richard MacCutchan

v2

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elgaabeb · Accepted Answer · 2011-11-21T22:39:00

Solution 1

Hi,

A cast a conversion from a type to another.
Iimagine we have these elements :
- Class B that inherits from A.
- Functions F1 return a A class type object.

Inside F1 you handle ojects of type B and you want to return it as function return value.
To do that you need to cast B to A ( it is called UP-CASTING) then you can return it.

Java

B objectB = new B()
...
retObject = (A) objectB;
return retObject;

Hope this helps

Posted 21-Nov-11 22:39pm

elgaabeb

Updated 22-Nov-11 2:12am

v2

Comments

hamzah1 22-Nov-11 4:44am

Thanks Bro it helps me :D

elgaabeb 22-Nov-11 4:48am

You're welcome Bro :) if you like my solution vote it by stars ;))