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Java - converting an integer to a fixed length string

There are some things in Java which you would think are no-brainers (one-liners) but turn out to be not quite so simple. This issue has improved over the years, with additions of methods like split to java.lang.String, but some gaps remain. And the solution - the joy of an OO langauge - is for you to write a solution that fits you (and your organisation) just one, and then have it as a one-liner as you wanted, but better than that have it tuned to your specific needs.

Converting an integer to a string, fixed width, space padded. Easy with a function call. Here's the call
  expandTo(builder[row][col],6)
and here's the function defintion:
  public static String expandTo(int val, int cols) {
    StringBuffer wip = new StringBuffer(Integer.toString(val));
    while (wip.length() < cols) wip.insert(0," ");
    return wip.toString();
    }


Reading a number from the user. Easy with a function call. Here's the call
  daily[so_far] = WellHouseInput.readNumber();
and you can find the function definition [here]
(written 2015-02-04)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
J707 - Java - Strings
  [4393] Splitting Java strings and extracting numbers - (2015-01-13)
  [3048] String handling - from first steps to practical examples - (2010-11-13)
  [2649] Length, size or capacity in Java? - (2010-02-24)
  [1557] Trying out our Java examples on our web site - (2008-02-27)
  [1446] An answer to a student asking 'Help' - (2007-11-27)

J713 - Java - More Input and Output
  [4420] Flexibility in input - read from file, web resource or keyboard - (2015-02-08)
  [4350] Keyboard reader for Java programming newcomers - (2014-12-12)
  [2420] Exceptions in Java - why and how - (2009-09-24)
  [1239] End of File on a Java BufferedReader - (2007-06-22)


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Buffet review - taking the price into account
Java - converting an integer to a fixed length string
Binomial Coefficient (Pascal Triangle) objects in Java
Java -making sure you have the right versions
Location, location location. And a chance of a giggle!
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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