Align printf output in Java

Question

I need to display a list of items with their prices from an array and would like to align the prices  I almost have it working but needs improvements  Below is the code and the output  Any ideas how to make all prices aligned  So far some work but some don t  Thanks in advance     for loop System out printf   d   s  t t    2f n                   i   1  BOOK TYPE i   COST i      output   1  Newspaper          1 00 2  Paper Back         7 50 3  Hardcover book         10 00 4  Electronic book        2 00 5  Magazine           3 00

User · Answer

You can refer to this blog for printing formatted coloured text on console

https://javaforqa.wordpress.com/java-print-coloured-table-on-console/

public class ColourConsoleDemo {
/**
*
* @param args
*
* "\033[0m BLACK" will colour the whole line
*
* "\033[37m WHITE\033[0m" will colour only WHITE.
* For colour while Opening --> "\033[37m" and closing --> "\033[0m"
*
*
*/
public static void main(String[] args) {
// TODO code application logic here
System.out.println("\033[0m BLACK");
System.out.println("\033[31m RED");
System.out.println("\033[32m GREEN");
System.out.println("\033[33m YELLOW");
System.out.println("\033[34m BLUE");
System.out.println("\033[35m MAGENTA");
System.out.println("\033[36m CYAN");
System.out.println("\033[37m WHITE\033[0m");

//printing the results
String leftAlignFormat = "| %-20s | %-7d | %-7d | %-7d |%n";

System.out.format("|---------Test Cases with Steps Summary -------------|%n");
System.out.format("+----------------------+---------+---------+---------+%n");
System.out.format("| Test Cases           |Passed   |Failed   |Skipped  |%n");
System.out.format("+----------------------+---------+---------+---------+%n");

String formattedMessage = "TEST_01".trim();

leftAlignFormat = "| %-20s | %-7d | %-7d | %-7d |%n";
System.out.print("\033[31m"); // Open print red
System.out.printf(leftAlignFormat, formattedMessage, 2, 1, 0);
System.out.print("\033[0m"); // Close print red
System.out.format("+----------------------+---------+---------+---------+%n");
}

User · Answer

A simple solution that springs to mind is to have a String block of spaces   String indent                            20 spaces    When printing out a string  compute the actual indent and add it to the end   String output    Newspaper   output    indent substring 0  indent length - output length     This will mediate the number of spaces to the string  and put them all in the same column

User · Answer

Format specifications for printf and printf-like methods take an optional width parameter   System out printf    10d   25s   25 2f n                      i   1  BOOK TYPE i   COST i       Adjust widths to desired values

User · Answer

You can try the below example  Do use  -  before the width to ensure left indentation  By default they will be right indented  which may not suit your purpose   System out printf   2d   -20s    2f n    i   1  BOOK TYPE i   COST i      Format String Syntax  http   docs oracle com javase 7 docs api java util Formatter html syntax  Formatting Numeric Print Output  https   docs oracle com javase tutorial java data numberformat html  PS  This could go as a comment to DwB s answer  but i still don t have permissions to comment and so answering it

User · Answer

Here s a potential solution that will set the width of the bookType column  i e  format of the bookTypes value  based on the longest bookTypes value   public class Test       public static void main String   args            String   bookTypes      Newspaper    Paper Back    Hardcover book    Electronic book    Magazine             double   costs     1 0  7 5  10 0  2 0  3 0                Find length of longest bookTypes value          int maxLengthItem   0          boolean firstValue   true          for  String bookType   bookTypes                maxLengthItem    firstValue    bookType length     Math max maxLengthItem  bookType length                 firstValue   false                        Display rows of data         for  int i   0  i  lt  bookTypes length  i                     Use  6 2 instead of   2 so that decimals line up  assuming max                book cost of  999 99  Change 6 to a different number if max cost                is different             String format     d   -    Integer toString maxLengthItem     s  t t   9 2f n               System out printf format  i   1  bookTypes i   costs i

[java] Align printf output in Java

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