Re :Results of mock test

[ragi singh]

I have few questions from mock test on exception handling . I tried it on the link
http://www.skillrack.com/mockscorereport.jsf?cid=701
but i am doubtful about the following answers . Please help me solve my doubts .
Question1

 

package com.skillrack.exception;
	 
	class T {
	 
	    private static T staticT=null;
	    public static void main(String[] args) {
	        try {
	           T t= new T();
	        } catch (Exception ex) {
	            System.out.println(null==staticT);
	        }
	    }
	 
	    public T() throws Exception {
	        staticT=this;
	        throw new Exception("Exception");
	    }
	 
	     
	}
	

Options are:-
a. prints true as the Exception in the constructor prevents the Object being initialized
b. prints false

My doubt is how can a constructor throw an exception ?

[ragi singh]

I have not read any article wherein the constructor can throw an exception

[Benish Zaidi]

Hi,
In your code above, staticT, did get initialized. If you can see your code

   
System.out.println(null==staticT);

This particular statement is checking whether null and staticT point towards the same object. They don't
thats why the output is false. If you amend your code and put a printout statement before the equality,
you will see staticT, does refer to an object.

Hope this helps,

[ragi singh]

but my question remains can a constructor throw an exception

[Benish Zaidi]

Yes a constructor can throw an exception. There are many articles over google.
Just type, Can constructors throw an exception OR not? Actually, by throwing an
exception only from the constructor an object creation can be avoided. In your case
object t is not created.

Hope this helps,

[ragi singh]

ok thank you

[santosh dhulipala]

i am sorry i havent seen the code completly

[Abimaran Kugathasan]

santosh dhulipala wrote:i am sorry i havent seen the code completly

Like methods, Constructors, Instance Initialization blocks can throw exceptions.