Number of String objects

[Deepak Bajoria]

How many String objects will be created when this method is invoked?

 
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. }

As per my understanding string object created would be:
"Fred",
"47",
"Fred47"
"ed4"
"ED4"

Please correct me if wrong

[Sandeep Bhandari]

the only confusion was toString method.
referred the API and here's the toString method of String class

    public String toString() {
return this;
    }

which makes your answer correct.

[Jesper de Jong]

This exact same question has been asked and answered many times before:

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etc...

[Sazzad Hossain]

Hi Deepak

From my understanding you are right. total 5 objects will be created. the toString() method will return the object itself. It will not creat any new object according to sun api.

[Nabila Mohammad]

Originally posted by Deepak Bajoria:
How many String objects will be created when this method is invoked?

 
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. }

As per my understanding string object created would be:
"Fred",
"47",
"Fred47"
"ed4"
"ED4"

Please correct me if wrong

Sandeep,
Are you completely sure?

Because ther has been a lot of discussion on this question (That's another thing that I still don't remember the correct answer!)

But as far as i remember..
I remember some one mentioning that this question asks "when this method is invoked"
And "47" is created in the pool during compile time, so in that case "47" won't be included in the list of String created.

I belive there are 4 Strings that are created.

Some one correct if I am wrong.
[ July 21, 2008: Message edited by: Nabila Mohammad ]

[Nabila Mohammad]

Looks like there are 3 Strings created when the method is invoked.

"Fred" and "47" are String literals which are created when the class is loaded.

toString() doesnot create a new String.


Thanks Jesper for the link.

[Raphael Rabadan]

Originally posted by Nabila Mohammad:
Looks like there are 3 Strings created when the method is invoked.

"Fred" and "47" are String literals which are created when the class is loaded.

toString() doesnot create a new String.


Thanks Jesper for the link.

I've made the same question before. And yes, it's 3 because "Fred" and "47" are already created.