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Converting a number into string separated by commas.

 
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How to convert a number to string seperated by commas?
I know to convert 1234567 to 1,234,567 using this
String number = NumberFormat.getNumberInstance(Locale.CANADA).format(1234567);

but how to convert into 12,34,567.
Thanks for any help.
 
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Welcome to the Ranch

Is that a standard format for anywhere? If so, what happens when you try this?
System.out.println(String.format(Locale.RURITANIA, "%,d", 1234567890));
 
Java Cowboy
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Campbell, this is a common way to format numbers in India and unfortunately Java's NumberFormat and DecimalFormat don't seem to support this (at least not in any obvious way). I don't know the answer to the question.
 
shashank shashi
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Campbell, I tried your suggestion but eclipse is showing an error RURITANIA cannot be resolved or is not a field.
 
Campbell Ritchie
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Damn!

I had tried it with Locale.INDIA but that didn't work.
Does that mean
new DecimalFormat("##,##,###")
or some other such java1.3 style horror? I suspect even that won't work, because it says that variable separations of thousands separators are removed automatically.
 
Campbell Ritchie
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Ruritania only exists in books by Hope. It is like American lawyers referring to a hypothetical person as John Doe.
 
Campbell Ritchie
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Yes Jesper is right, it is not supported by Java out of the box.

Shashank, you have to format it programmatically and it is quite doable a task.
 
shashank shashi
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Thankyou all for your help.I will definitely give it a try.
 
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There's a solution offered on StackOverflow that uses com.ibm.icu.text.DecimalFormat.
 
shashank shashi
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Campbell Ritchie wrote:



Campbell you made my day,its perfect.
By the way,I just came into the coderanch and this was a great welcome,you guys are awesome:-)
 
Campbell Ritchie
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Darryl Burke wrote:There's a solution offered on StackOverflow that uses com.ibm.icu.text.DecimalFormat.

That is a nice solution. There are other solutions on that same SO thread which look pretty awful to me.

SS: What did you come up with? [Edit]Challenge: work out how to use a StringBuiider and its insert method to produce the result you require[/edit]
 
shashank shashi
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Campbell tried using StringBuilder it works fine.Thankyou
 
Tapas Chand
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You are on right track, just need to check few things.
Have you tried to run your code when
 
Campbell Ritchie
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Also it would be more elegant (I think) to use a while loop rather than a for loop.
 
shashank shashi
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Thankyou Tapas I had missed it.Hope this is correct.
Campbell,I used while loop and measured the time of execution it was a lot fater than for.Once again,Thankyou.
 
Tapas Chand
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shashank shashi wrote:Campbell,I used while loop and measured the time of execution it was a lot fater than for.Once again,Thankyou.[code=java]


Don't know how you measured, but there should not be any difference in execution time in your case.
If I am correct, Campbell meant while loop will be more readable.
 
Tapas Chand
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shashank shashi wrote:Thankyou Tapas I had missed it.Hope this is correct.


I am afraid still there is something you need to check.
Have you tried executing your code with
 
shashank shashi
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Thankyou tapas,i had missed it agian :-(.I used the below code to measure time and most of the time while loop was faster(i dont know why).There was only some nanoseconds difference.While loop is definitely more readable than for loop.

 
Tapas Chand
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I executed the code several times. Few times while loop is taking more time than for loop.
So it cannot be concluded that while loop is faster than for loop, at least in this case.

And for your information, you need not include the import statement in this code.
All classes under java.lang are automatically imported in Java.
 
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Tapas Chand wrote:I am afraid still there is something you need to check.
Have you tried executing your code with?


Tapas, well deserved cow - for thinking about the corner cases twice in this thread, and for putted effort in assisting on multiple other threads.
 
shashank shashi
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Yes, i saw the discussion on stackoverflow regarding performance between for and while loop. Thanks for pointing out the import statement.
 
Tapas Chand
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Liutauras Vilda wrote:Tapas, well deserved cow - for thinking about the corner cases twice in this thread, and for putted effort in assisting on multiple other threads.


Thank you so much
 
Campbell Ritchie
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shashank shashi wrote: . . . measured the time of execution it was a lot fater than for.Once again,Thankyou.
. . .

You're welcome

But how did you time the execution?
 
Campbell Ritchie
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I see my question has already been answered, and Tapas Chand has tried it out.
 
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