How can I convert a string(1,234) into a number(1234) using java

Question

How can I convert a string

 (1,234)

into a number

(1234)

using java?

Is Google down? Folks, can anyone fling around a dead cat not to hit an answer to this question? — ppeterka, Oct 10 '13 at 09:56
@SubirKumarSao You can't know which **Locale** OP is in... There are locales where this is a valid integer, and some where this is considered a fraction... — ppeterka, Oct 10 '13 at 09:57
@ppeterka66 I'm still struggling to find a duplicate on this site, however. Must be one somewhere... — Duncan Jones, Oct 10 '13 at 10:04
@ppeterka66 Agreed `,` & `.` could mean opposite based on locale. But in this scenario it does not looks so. — Subir Kumar Sao, Oct 10 '13 at 10:04
that's what you're looking for http://stackoverflow.com/questions/11973383/how-to-parse-number-string-containing-commas-into-an-integer-in-java ? — Stephane Delcroix, Oct 10 '13 at 10:17

score 6 · Answer 1 · answered Oct 10 '13 at 10:02

6

Use DecimalFormat

DecimalFormat  format = new DecimalFormat  ("#,###");
Number aNumber = format.parse("1,234");
System.out.println(aNumber.intValue());

answered Oct 10 '13 at 10:02

vels4j

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If you'd add a notion of how locale can affect the decimal point, it would be a very good answer. – ppeterka Oct 10 '13 at 10:04

score 2 · Answer 2 · answered Oct 10 '13 at 10:02

2

you can use NumberFormat for that

   String number = "1,234";
   NumberFormat numberFormat = NumberFormat.getInstance();
   int i = numberFormat.parse(number).intValue();

answered Oct 10 '13 at 10:02

Prabhaker A

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newuser · Answer 3 · 2013-10-10T10:05:28.023

1

Try String.repaceAll()

String value = "1,234";
System.out.println(Integer.parseInt(value.replaceAll(",", "")));

edited Oct 10 '13 at 10:05

answered Oct 10 '13 at 09:56

newuser

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but i directly convert it as Integer. Why can i assign the replaced value again – newuser Oct 10 '13 at 10:01
I don't understand all the down-votes. This code example is correct. However you can remove `""+` in your `println` statement. – Duncan Jones Oct 10 '13 at 10:03
1

@DuncanJones I did not downvote and that comment was for the previous edit of this post.. Now it seems to be correct – sanbhat Oct 10 '13 at 10:04
@sanbhat jones didn't mean that cool – newuser Oct 10 '13 at 10:08
1

you edited your answer. check ur first one.. – gifpif Oct 10 '13 at 10:10
@Pawanmishra I know i edited the answer. At first i didn't convert as number. That's my fault – newuser Oct 10 '13 at 10:12
downvoting seems to be a fashion now.If downvoting why not leaving a comment – SpringLearner Oct 10 '13 at 10:30
@javaBeginner you are correct – newuser Oct 10 '13 at 10:31
The best way to avoid down-votes is to fire up your IDE and test the code before you post. – Duncan Jones Oct 10 '13 at 10:32
@DuncanJones there is nothing wrong in my answer still downvote – SpringLearner Oct 10 '13 at 10:33
@javaBeginner Did you post something incorrect and then correct it shortly after? If so, the down-voter may have not seen the correction. Otherwise, you are perhaps just the victim of the Internet and its mysterious ways. – Duncan Jones Oct 10 '13 at 10:35
@DuncanJones I think the second one is right – SpringLearner Oct 10 '13 at 10:36
@javaBeginner Well... until 9 minutes ago you had a typo. Perhaps someone was being fussy. A comment wouldn't have hurt, of course. – Duncan Jones Oct 10 '13 at 10:37
1

@DuncanJones now also again downvote i mean after edit – SpringLearner Oct 10 '13 at 10:37
@newuser congratulaions you got another downvote and me too – SpringLearner Oct 10 '13 at 10:38
Here i thank to the beginning downvoters who indicate my mistake. But now the current downvotes doesn't know anything what i before did. – newuser Oct 10 '13 at 10:44
@newuser your answer is correct so +1 from myside – SpringLearner Oct 10 '13 at 10:51

SpringLearner · Answer 4 · 2013-10-10T10:27:31.170

0

String str = new String("1,234");
    String str1=str.replace(",", "");
    Integer.parseInt(str1);

try with the above code

output 1234

edited Oct 10 '13 at 10:27

answered Oct 10 '13 at 10:04

SpringLearner

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@downvoter if you are not getting output then please show the screenshot – SpringLearner Oct 10 '13 at 10:28
All credits goes to the questionare – newuser Oct 10 '13 at 10:53

score 0 · Answer 5 · answered Oct 10 '13 at 10:04

0

String is immutable, so when you do replaceAll, you need to reassign object to string reference,

String str = new String("1,234");
str = str.replaceAll(",", "");
System.out.println(Integer.parseInt(str));

This works fine when tested.

answered Oct 10 '13 at 10:04

codingenious

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score -2 · Answer 6 · edited May 23 '17 at 12:28

-2

If speed was a major concern you may find something like this quite fast. It beat all comers in this post.

int value(String s) {
  // Start at zero so first * 10 has no effect.
  int v = 0;
  // Work from the end of the string backwards.
  for ( int i = s.length() - 1; i >= 0; i-- ) {
    char c = s.charAt(i);
    // Ignore non-digits.
    if ( Character.isDigit(c)) {
      // Mul curent by 10 and add digit value.
      v = (v * 10) + (c - '0');
    }
  }
  return v;
}

edited May 23 '17 at 12:28

Community

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1

answered Oct 10 '13 at 10:10

OldCurmudgeon

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This seems a rather manual way of achieving the goal. Any reason this should be preferred to the more succinct answers? – Duncan Jones Oct 10 '13 at 10:37
@DuncanJones - It **may** be faster than all of the others if speed is a concern. Happy with a downvote or two ... it is only a route I would take if speed was critical. Added caveat. – OldCurmudgeon Oct 10 '13 at 10:46
FWIW, I didn't down-vote you myself - the answer looks correct. I was just interested in possible benefits. Some rather trigger happy down-voters circulating this question for some reason. – Duncan Jones Oct 10 '13 at 10:54
This is just reinventing of wheel and would require modifications if integer format in input string would change. OP wasn't concerned about speed. – Piro Oct 10 '13 at 12:01

How can I convert a string(1,234) into a number(1234) using java

6 Answers6