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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();
a.m1(null);
}
void m1(Throwable t)
{
System.out.println("Throwable");
}
void m1(Exception t)
{
System.out.println("Exception");
}
void m1(StringBuffer t)
{
System.out.println("StirngBuffer");
}

}


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)
{
System.out.println("StirngBuffer");
}

application is compiled fine;

when i run the class

i am getting o/p

Hello World!
Exception

but i assumed o/p will be

Hello World!
Throwable

why??
Ernest Friedman-Hill
author and iconoclast
Marshal

Joined: Jul 08, 2003
Posts: 24183
    
  34

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.


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