For 2023 (and 2024 ...) - we are now fully retired from IT training. We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here)) |
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 J713 - Java - More Input and Output [1239] End of File on a Java BufferedReader - (2007-06-22) [2420] Exceptions in Java - why and how - (2009-09-24) [4350] Keyboard reader for Java programming newcomers - (2014-12-12) [4420] Flexibility in input - read from file, web resource or keyboard - (2015-02-08) J707 - Java - Strings [1446] An answer to a student asking 'Help' - (2007-11-27) [1557] Trying out our Java examples on our web site - (2008-02-27) [2649] Length, size or capacity in Java? - (2010-02-24) [3048] String handling - from first steps to practical examples - (2010-11-13) [4393] Splitting Java strings and extracting numbers - (2015-01-13)
Some other Articles
Melksham Community Campus - which of these potential signs do you like?Crisp morning, fast runChallenging the IT course business modelBuffet review - taking the price into accountJava - converting an integer to a fixed length stringBinomial Coefficient (Pascal Triangle) objects in JavaJava -making sure you have the right versionsLocation, location location. And a chance of a giggle!A good example of recursion - a real use in PythonSetting up and using a dict in Python - simple first example
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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.
Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).
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