Win a copy of Murach's MySQL this week in the JDBC and Relational Databases forum!
  • 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 Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

How does Java compiler resolve the ambiguity to decide which methods to call?

 
Ranch Hand
Posts: 43
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
While going through some mock test i found this question.
This is not at all clear that when we pass null in the method the subtester version of the method is being called.


class Tester {
void test(Object s) { System.out.println ("Object version"); }
void test(Tester s) { System.out.println ("Tester version"); }
void test(SubTester s) { System.out.println ("SubTester version"); }

// Not compilable any more if you uncomment the line
// since String and Tester are siblings
// void test(String s) { System.out.println ("String version"); }

public static void main (String args[]) {
Tester c = new Tester ();
// Ambiguous, the most specific one which fit will be call
c.test (null); // SubTester version
c.test (new Object()); // Object version
}
}

class SubTester extends Tester{
}
 
Sheriff
Posts: 11343
Mac Safari Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
See our SCJP FAQ: What is a most-specific method?
 
If you look closely at this tiny ad, you will see five bicycles and a naked woman:
a bit of art, as a gift, that will fit in a stocking
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic