• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Bear Bibeault
  • Devaka Cooray
  • Liutauras Vilda
  • Jeanne Boyarsky
Sheriffs:
  • Knute Snortum
  • Junilu Lacar
  • paul wheaton
Saloon Keepers:
  • Ganesh Patekar
  • Frits Walraven
  • Tim Moores
  • Ron McLeod
  • Carey Brown
Bartenders:
  • Stephan van Hulst
  • salvin francis
  • Tim Holloway

Ambiguous for Compiler  RSS feed

 
Ranch Hand
Posts: 62
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Friends ,
Can anyone explain reason for the following error
Following code won't Compile
it shows Compile time error

dd.java:2192: reference to dd is ambiguous, both method dd(Object) in dd and met
hod dd(int[]) in dd match
new dd(null);


public class dd
{

dd(Object o)
{

System.out.println("Object ");
}

dd(int[]a)
{

System.out.println("Object 111");
}
public static void main(String []p)
{
new dd(null);

}

}
 
Ranch Hand
Posts: 809
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator



public class dd
{

dd(Object o)
{

System.out.println("Object ");
}

dd(int[]a)
{

System.out.println("Object 111");
}
public static void main(String []p)
{
new dd(null);

}

}


In your code, null can be assigned to Object o or array a. Remember arrays in java are objects.
Since both methods r most specific, compiler can't pick the right method and give error at compilation time.


See JLS - 15.12.2.5 Choosing the Most Specific Method

Selecting the Most Specific Method

---------------------------------------------------------------------


Use java naming convention


regards

Naseem Khan
 
Ranch Hand
Posts: 245
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Here int[] method is more specific, and the code compiles fine in JBuilder on my PC.
 
swarupa patil
Ranch Hand
Posts: 62
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Naseem Khan ,
I got it but I want to know what's
reason behind it ?
can u give answer?
 
Naseem Khan
Ranch Hand
Posts: 809
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
You are true...
I compiled it on jdk 1.5 and it compiles correctly and at runtime gives output.... Object 111

array version is more specific than object version coz any java object can be referenced by Object including array.
Object class is MOTHER of everything.

My previous reply was not correct. It won't give any compilation error on 1.5

regards

Naseem

[ May 17, 2006: Message edited by: Naseem Khan ]

[ May 17, 2006: Message edited by: Naseem Khan ]
[ May 17, 2006: Message edited by: Naseem Khan ]
 
Naseem Khan
Ranch Hand
Posts: 809
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Swarupa,
If u r still getting compilation error, then plz let me know on which version of java u compiled dis code.

regards

Naseem.K
 
Consider Paul's rocket mass heater.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!