Which overloaded method will be called if i am passing null as argument?

[Harpreet Singh janda]

Why the out put of below code is "String Version"

   public class AQuestion
{
  
    public void method(Object o) {
        System.out.println("Object Verion");
    }

 
    public void method(String s) {
        System.out.println("String Version");
    }

    public static void main(String args[]) {
        AQuestion question = new AQuestion();
        question.method(null);
    }
} 

I was expecting that it should print "Object Verion"

[Neha Daga]

When you make a call on overloaded methods the most specific one is called and definitely String is more specific than Object.
If you add following to your code you will get ambiguity as compiler have problem finding the specific one.

 public void method(Integer i) {
		System.out.println("Integer Version");
	}   

[Harpreet Singh janda]

Object class should be more specific not String class as Object is associated to all classes (As super class of all the classes).

Can you please clarify it a bit more?

[Neha Daga]

A subclass is always more specific than its Super class. Object is more generalised class which every class extends to become a more specific one.
Can a object class do evrything what a String or any of its subclasses specifically do???

[Harpreet Singh janda]

Oh, Thank you so much for clearing the doubt

[manishsharma sharma]

I think this question is from Abhilash's quiz , which is quite useful for SCJP , I have did that quiz while preparing for my SCJP.

checkout for some more question

http://www.angelfire.com/or/abhilash/



Thanks
Manish
http://javatechtips.blogspot.com