Number of String objects created

1 public String malkestring()
2 {
3 String s = "fred";
4 s = s + "47";
5 s = s.substring(2,5);
6 s= s.toUpperCase();
7
8 return s.toString();
9
10 }
11

Q. How many String objects are created?
A 1
B 2
C 3
D 4
E 5
F 6

The answer is given as c ie 3.

How can it be 3. According to the String class its objects are immutable.
So accordingly

Line 3: "fred" is one object
Line 4: "47" is one object
Line 4: "fred47" is one object
Line 5: "ed4" is one object
Line 6: "ED4" is one object

So Adding all together a total of 5 objects are created.

Please help me with this problem as to which is the right answer.

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Hi,

I too see 5 objects being created here. Is there anything we are missing ?

Sorry to say that I dont know the exact answer, but i can clarify it to some extent.You are forgetting the concepts of Garbage Collection and also you are not noticing that return statement in your code is also returning a String object(i.e toString() method).so i think the answer is "2".

Regards,
Mack.

i'm also confused with this question, please help.

regards,
gitesh

Praveen, please check your private messages. You can see them by clicking My Profile.

Hi,

There was a post regarding the number of String objects created, i think it will help to answer your question.

Please refer to the link below to access it:

http://www.javaranch.com

Thanks
Siphiwe M

The total number of objects created are "6".

Anup

Total 3 objects are created,

Check here:

http://www.coderanch.com/t/263415/java-programmer-SCJP/certification/many-String-objects-will-created

Gitesh