Question on String Object

[Sandeep Jindal]

11. public String makinStrings() {
12. String s = “Fred”;
13. s = s + “47”;
14. s = s.substring(2, 5);
15. s = s.toUpperCase();
16. return s.toString();
17. }
How many String objects will be created when this method is invoked?
A. 1
B. 2
C. 3
D. 4
E. 5
F. 6

I think the answer is 6, but somebody says it 3. Please confirm!

[Seetharaman Venkatasamy]

Every step one object is created.so totally 5 objects

[Ninad Kulkarni]

Hi Sandeep,
Please tell the source of question

 public String makinStrings() { 
 String s = “Fred”;   // one object here
 s = s + “47”;         //  one "47" and other result of concatanation  two objects here
 s = s.substring(2, 5);    // "ed4" one object here
 s = s.toUpperCase();    //   "ED4"    one object here
 return s.toString();        // no string created return same object    
 } 

so 5 objects created option E is correct

Correct me if I am wrong

[Sandeep Jindal]

Ninad Kulkarni wrote:Hi Sandeep,
Please tell the source of question

I dont know the real source of the question. My friend forwarded me some questions.

I do agree with you that 5 object would be created.
But to justify three, I would say:
"Fred" and "47" would not be the String objects in Heap, but would be created in String Pool.
Is that justification correct for answer 3?

[Bob Wheeler]

Do a search with "Fred 47". This question has been asked several times.

cheers
Bob

[Sandeep Jindal]

Bob Wheeler wrote:Do a search with "Fred 47". This question has been asked several times.

Seems it is really a famous question. thanks!