File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
The moose likes Beginning Java and the fly likes Why this is compile time error Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "Why this is compile time error" Watch "Why this is compile time error" New topic
Author

Why this is compile time error

Chiranjeevi Kanthraj
Ranch Hand

Joined: Feb 18, 2008
Posts: 290

Hi all

if i have a method like



i can call someMethod(null)

But if i have the



i cant call someMethod(null) which gives compile time error


Please explain why?
Thanks


-Chiru
Ernest Friedman-Hill
author and iconoclast
Marshal

Joined: Jul 08, 2003
Posts: 24189
    
  34

The compiler will choose the "most specific" method. Because String is a subclass of Object, there's a clear choice between the first two methods; a subclass is deemed to be "more specific" than the superclass. But in your second example, String and StringBuffer are both subclasses of Object, so neither is more specific than the other; there's no clear choice, so it's a compile-time error.


[Jess in Action][AskingGoodQuestions]
 
jQuery in Action, 2nd edition
 
subject: Why this is compile time error