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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
First Java Application - calculating the weight of a tablecloth

From last week's Java course - the first practical demonstration program I wrote:
• prompts for user input
• reads that input
• calculates
• outputs results

That's the stage I look to get to quickly on a course to give my delegates some idea early on of how the language goes together - source code in this case is [here].

In Java, reading from the keyboard is reading from a stream for which you have to use an appropriate class. You must catch exceptions which can be of various types, all of which are direct or indirect subclasses of a base class object. If this is starting to feel complex, fear not. "If you want to do something that's commonly done, chances are people have done it before and made it available" ... and indeed I have provided a class (well reader) which hides all this complexity from the newcomer and lets you read numbers easily.

The actual application reads the width and length of a table, and calculates the weight of a table cloth to fit that table, with appropriate overhang. Should you ask "who weighs their table cloths" I will answer "we do" - weighing linen is a very useful way for a commercial cafe or hotel to tell similar but not the same pieces apart once they've been washed and ironed, and our scales are a vital piece of laundry equipment!
(written 2014-11-29)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
J601 - Java Introduction
  [25] Release numbers - (2004-08-23)
  [111] Training notes available under Open Distribution license - (2004-11-07)
  [124] PHP v Java - (2004-11-20)
  [317] Programming languages - a comparison - (2005-05-20)
  [792] Is Java the right language to learn? - (2006-07-04)
  [871] Java oversold? - (2006-09-19)
  [1049] Java 6, Apache Tomcat 6. - (2007-01-21)
  [1158] Private Java Course - A customer's pictures - (2007-04-22)
  [1418] A Golf Club Decision - Perl to Java - (2007-11-01)
  [1466] Effective Java training - the bootcamp approach - (2007-12-09)
  [1497] Training Season Starts again! - (2008-01-07)
  [1557] Trying out our Java examples on our web site - (2008-02-27)
  [1766] Diagrams to show you how - Tomcat, Java, PHP - (2008-08-22)
  [1908] Java CLASSPATH explained - (2008-11-26)
  [2115] Finding your java program - the CLASSPATH variable - (2009-04-02)
  [2423] What is a JVM, a JRE, a JDK - components of the core Java Environment - (2009-09-26)
  [2536] All the Cs ... and Java too - (2009-12-13)


Back to
Musings on a Welsh town
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Horse's mouth home
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Misty Melksham Morning
Some other Articles
Test Driven Development - a first example of principle in C
Flexible public courses - residential or commuting, programming newcomer or experienced, C or C++
Splitting out code into name blocks for clarity and reusability
Misty Melksham Morning
First Java Application - calculating the weight of a tablecloth
Musings on a Welsh town
Java - factory method, encapsulation, hashmap example
Does Santa Claus need a CRB check?
Folk music train, Westbury to Swindon round trip, 14th December 2014
Good, stable, reliable local businesses
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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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