File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Beginning Java and the fly likes what will be the output and why Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "what will be the output and why" Watch "what will be the output and why" New topic

what will be the output and why

kesava chaitanya
Ranch Hand

Joined: Aug 15, 2001
Posts: 140
package example;

class dup
public static void main(String[] args)
System.out.println("Hello World!");
dup a=new dup();
void m1(Throwable t)
void m1(Exception t)
void m1(StringBuffer t)


when i run this class i am gettiing this exception

Error(9,5): reference to m1 is ambiguous; both method m1(java.lang.Exception) in class example.dup and method m1(java.lang.StringBuffer) in class example.dup match

if i remove this method

void m1(StringBuffer t)

application is compiled fine;

when i run the class

i am getting o/p

Hello World!

but i assumed o/p will be

Hello World!

Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24199

When resolving overloaded methods, the compiler chooses the most specific applicable overload. Because Exception is a subclass of Throwable the m1(Exception) overload is "more specific". On the other hand, there's no way to decide which of Exception or StringBuffer matches better, so with all three methods, you get the compile error.

[Jess in Action][AskingGoodQuestions]
I agree. Here's the link:
subject: what will be the output and why
jQuery in Action, 3rd edition