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  1. #1
    DoubleAG is offline Member
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    Apr 2011
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    Default How to add spaces

    I am writing a program that writes 100 integers created randomly. I need spaces after each integer but I can't figure out how to do that. Here's the code that I have. Thanks for the help.

    for (int i = 0; i < 100; i++)
    output.format("%d", (int)(Math.random() * 100000));

  2. #2
    oomrichie is offline Member
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    I would suggest converting the Integer to a string before adding it add adding a space to the string. are you writing the values to a file?

  3. #3
    sunde887's Avatar
    sunde887 is offline Moderator
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    Jan 2011
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    To add spaces in a loop, you would do something like this
    Java Code:
    for(int i = 0; i < x; ++i){
      System.out.println("Hello "); //notice the space after the o

  4. #4
    pbrockway2 is offline Moderator
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    Is output a String? If so you are using the String format() method. It is worth following the link given in the API docs that describe the format string argument. ("%d").

    The format string can specify both the width of the resulting string and the alignment which in your case would be "left".

    The format() method is a static one, so it generally used as String.format(). There are similar methods in other classes that use the same format string syntax. For example output might be a Formatter instance obtained from a StringBuilder or similar. In that case you use it as output.format() as in your example. The first (format) argument would be as below.

    Java Code:
    public class Test {
        public static void main(String[] args) {
            for (int i = 0; i < 100; i++) {
                String output = String.format("%-5d|", (int)(Math.random() * 100000)); 

    The format string "%-5d" prints the argument as a decimal integer, at least 5 wide and is left aligned (-).
    Last edited by pbrockway2; 05-01-2011 at 12:54 AM.

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