Remove the last grouping separator when using DecimalFormat Grouping java

Question

I want to format lengthy double numbers in my android calculator app
2 problems ... First is that I want to enable Grouping by 3 so 1200 would be shown 1,200 . But for numbers like 1000 what I get is 1,
How can I get 1,000 for result ?

also another problem is that I want Results with up to 25 integer digits and 4 decimal fraction digits ... but even though I set Decimalformat maximum to 25, after number of integers surpasses 18, Digits turn to be zeros. for example what I want is
1,111,111,111,111,111,111,111,111
but I get
1,111,111,111,111,111,110,000,000,
Here's the code

 DecimalFormat df = new DecimalFormat();
    df.setMaximumFractionDigits(4);
    df.setMaximumIntegerDigits(25);
    df.setGroupingUsed(true);
    df.setGroupingSize(3);
    String formatted = df.format(mResultBeforeFormatting);

what pattern should I use ?

The first part is right in adding the commas. Why don't you then split it into an array by `,`? — SearchForKnowledge, Aug 12 '14 at 18:34
that's not clean coding ! thousand lines of code have been written in java classes so that I don't custom code for these stuff — 9patchcoder, Aug 13 '14 at 14:18

score 2 · Answer 1 · answered Aug 13 '14 at 14:25

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Ok so for others who face this problem like me for first part best pattern was

 DecimalFormat df = new DecimalFormat("###,##0.####");

for second problem as "x-code" noted it apears there's no hope using double . should try using BigDecimal

answered Aug 13 '14 at 14:25

9patchcoder

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score 0 · Answer 2 · edited May 23 '17 at 11:49

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I found answers to both parts of the question right here on StackOverflow.

First is that I want to enable Grouping by 3

Here are several solutions to the grouping problem.

another problem is that I want Results with up to 25 integer digits

In this case what's really happening is that Java doubles can't represent 25 decimal digits.

For this problem you might want to look at the BigDecimal class, which can represent the numbers in your example.

edited May 23 '17 at 11:49

Community

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answered Aug 12 '14 at 20:11

x-code

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Well for grouping actually those answers either don't address this problem or don't use native java classes (custom code) With BigDecimal I think your'e right – 9patchcoder Aug 13 '14 at 14:29

Remove the last grouping separator when using DecimalFormat Grouping java

2 Answers2