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Polymorphism vs Methods Signatures Best Fitness

2 replies on 1 page. Most recent reply: Jul 13, 2005 12:36 PM by Antonio

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Antonio

Posts: 33
Nickname: arhak
Registered: Jul, 2005

Polymorphism vs Methods Signatures Best Fitness

Posted: Jul 13, 2005 12:31 AM

Say we have two methods

void f(Object obj, String str) { System.out.println("obj - str"); }

and

viod f(String str, Object obj) { System.out.println("str - obj"); }

what should happend when you invoke

f("a", "b")

?

Do you think the compiler should warn us about it?
How (and Why) the compiler choose?

Kondwani Mkandawire

Posts: 530
Nickname: spike
Registered: Aug, 2004

Re: Polymorphism vs Methods Signatures Best Fitness

Posted: Jul 13, 2005 5:24 AM

Are you sure that would even get compilation
Stage?

Have you tried it?

Would it not complain about applying
f(java.lang.String, java.lang.String) to f(java.lang.Object,java.lang.String)?

Haven't tried it but I've come across similar
scenarios.

Antonio

Posts: 33
Nickname: arhak
Registered: Jul, 2005

Re: Polymorphism vs Methods Signatures Best Fitness

Posted: Jul 13, 2005 12:36 PM

Well, I have that doubt since JDK 1.2 or 1.3 maybe, when I tried and it did compile. But now you say so, I try again and it's fixed. It doesn't compile.

reference to f is ambiguous; both method f(java.lang.Object, java.lang.String) in ... and method f(java.lang.String, java.lang.Object) in ... match at ...

It's curious I haven't try with JDK 1.4 nor 1.5

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