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Why this is compile time error

Chiranjeevi Kanthraj
Ranch Hand

Joined: Feb 18, 2008
Posts: 288

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?

Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24166

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]
I agree. Here's the link:
subject: Why this is compile time error
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