solve this

[himanshu kesarwani]

What is the output ?

class Test02{

public String fetch(){
return null;
}

public static void main(String args[]){
Test02 obj = new Test02();
String str = obj.fetch();
System.out.println((str+"").toString());
}
}

[Ankit Garg]

Did you try to run the program??

Also please quote the source of the question...

[vamsi kris]

Hi, nice tricky question

 public class Test {
	
	public String get(){
		return null;
	}
	
	public static void main(String[] args) {
		Test t = new Test();
		String s = t.get();
		System.out.println(null + "< >");
		System.out.println(s);
		System.out.println((s+"<a b rel="nofollow">").toString());

	}

}
   

examine the code you can clear your doubt

output:
null< >
null
null<a b>

-vamsi

[Adi Kulkarni]

Hi himanshu ,

I think the example mentioned by you will throw a NullpointerException ( Runtime) , since in the system.out.println you are trying to use a reference variable not referring to any object. ( Its having null value).

~Aditya

[vamsi kris]

i think it doesnt throw a null pointer exception because you are converting a null object a string object in system.out.println(); statement so it compiles and runs correctly

[Muhammad Ijaz]

Actually it doesn't throw NullpointerException. Indeed the null is first concatinated with "" string. After that when null has been concatinated to "" String then it convert the null+"" into String with toString() method. So if we convert null+"" into String, no reason for NullpointerException.

Regards.
Pomy

[NagarajGoud uppala]

Hi vamsi,
your right. himunshu thank you for posting such a tricky question!!!

[Chaitanya Jadhav]

yes answer is null

BUT ... fallowing code throws Runtime NullPointerException

  
 class Test {
	public String fetch(){
	return null;
  } 
	public static void main(String [] args) {
    
	Test obj = new Test();
	String str= obj.fetch();
	System.out.println((str.toString())); 

	}
}
  

[Rocky Singh]

First of all please quote the source Himanshu !!

This program will throw a nullpointer exception !!

Have you seen executing this code ???