which values will be printed?

[maggie karve]

[quote]class ValHold{   
        public int i = 10;   
}   
  
public class ObParm{   
public static void main(String argv[]){   
        ObParm o = new ObParm();   
        o.amethod();   
        }   
        public void amethod(){   
                int i = 99;   
                ValHold v = new ValHold();   
                v.i=30;   
                another(v,i);   
                System.out.print( v.i );   
        }//End of amethod   
  
        public void another(ValHold v, int i){   
                i=0;   
                v.i = 20;   
                ValHold vh = new ValHold();   
                v =  vh;   
                System.out.print(v.i);   
        System.out.print(i);   
        }//End of another  
  
}   
  
1) 10030   
2) 20030   
3) 209930   
4) 10020 [quote]    [/quote][code]    

[/code]

[Seetharaman Venkatasamy]

did you run ?

P.S: Good Example to pass by value of reference and primitive

[Purvesh Maheshwari]

Ans will be 4) 10020

[Neha Daga]

answer is 4. 10020

[SanjayR Jain]

good question answer will 10020

[Kamil Wojcik]

We know that the answer will be 10020, but can someone explain, why at the and we get 20? Thanks

[Shams Tabrez Ahmed]

code at line 20 changes the value of int i of the object instantiated at line 12

[Ben Power]

Kamil Wojcik wrote:We know that the answer will be 10020, but can someone explain, why at the and we get 20? Thanks

At line 20, the another() method changes v.i to 20. Remember, when you pass an Object reference to a method, you pass a copy of the reference, not a separate copy of the object. So now, v.i points to the same v that was declared in line 12. So when the another() method completes and we resume at line 15, the value of v.i has been changed to 20. Does that make sense?

This is an excellent question.

Ben

[Rajiv Chopra]

Hey when you pass a referance variable to a method you are not only passing the address of that referance variable but that is copy of that referance variable address.
This means that you are passing copy of referance variable to ValHold v.
Then you are changing that value to vh(another object) The previous referace object is still same uneffected.

Remember you can always change the value of the passing object but you can't change the passing object to refer to other object.

[Rajiv Chopra]

Hey when you pass a referance variable to a method you are not only passing the address of that referance variable but that is copy of that referance variable address.
This means that you are passing copy of referance variable to ValHold v.
Then you are changing that value to vh(another object) The previous referace object is still same uneffected.

Remember you can always change the value of the passing object but you can't change the passing object to refer to other object.

   public class Test {
public static void main(String[] args){
String value = "abc";
changeValue(value);
System.out.println(value);
}
public static void changeValue(String a){
a = "xyz";
}
}
 

Answer is abc.