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Thread: Formatting white space to 3 characters in parentheses

  1. #1
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    Default Formatting white space to 3 characters in parentheses

    Hello,
    In my program i have to count a certain number of days and increase the counter as it goes through the loop. I have to display this number in parenthesis with exactly 3 spaces(including numbers) enclosed in the parenthesis as see below:

    Yearly temperature data for Denver
    <= 9 ( 3):***
    10 - 19 ( 4):****
    20 - 29 ( 9):*********
    30 - 39 ( 27):***************************
    40 - 49 ( 47):********************************************** *
    50 - 59 ( 66):********************************************** ********************
    60 - 69 ( 62):********************************************** ****************
    70 - 79 ( 44):********************************************
    80 - 89 ( 66):********************************************** ********************
    90 - 99 ( 37):*************************************
    >=100 ( 0):



    How would i make it to where the parentheses only allow 3 characters at all times? Meaning that if it was 5 it would just show ( 5) <----- has two spaces before the 5, and if it was 15 it would just show ( 15)<----has one space before the 15, and if it was 114 it would show (114) <----no spaces, just numbers

    i am using the format method right now and if i use "000" it will still show the leading zero(for two digit numbers)...if i use "###" it will just display the number by itself and no spaces at all.



    any help would be greatly appreciated! Thank you!!


  2. #2
    Super Moderator pbrockway2's Avatar
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    Default Re: Formatting white space to 3 characters in parentheses

    Consider using the String.format() method. The format string is described in detail in the Formatter API linked to from there. They take a little getting used to, but are quite flexible.

    public class FormatterEg {
        public static void main(String[] args) {
            int[] data = {-5, 0, 1, 42, 666};
            for(int test :data) {
                System.out.printf("(%3d)%n", test);
            }
     
                // once more, with precision...
            double[] data2 = {-1, 0, Math.PI, Math.E};
            for(double test :data2) {
                System.out.printf("(%-8.4f)%n", test);
            }
        }
    }

    The first format string means:

    ( literal left parenthesis
    % format
    3 three wide
    d decimal integer
    ) literal right parenthesis
    %n new line

    The second one illustrates how a fixed number of decimal places can be obtained (with correct rounding).

    ( literal left parenthesis
    % format
    - left align
    8 eight wide
    .4 including four decimal places
    f floating point number
    ) literal right parenthesis
    %n new line

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