For 2023 - 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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Who can use which access door?
Anyone can come to our front door and ring the bell. It's then up to us whether we admit them to the house, or deal with them at the door. You can describe the front door as being public
The side door through Lisa's office is more restricted, and whilst I and other members of the team can gain access through there, it's not how other visitors should gain entry. So the side door is protected
If anyone comes up to our place and happens to find we've left the door open ... walks in and knocks on the loo door when I'm in there, I'll probably be pretty unforgiving unless it's Lisa. Have I ever told you that Lisa and I are pretty close and come as a package
And anyone who walks into the house, and straight into the toilet when someone's already using it is - well - invading their privacy
In Java, classes, methods and variables which might be accessible outside a class are marked public, protected, or private using a similar philosophy to I use on my doors. public
is the widest access of all, and anything marked public will probably include checks to vet calls and usages and make sure they're valid. protected
allows access from classes in the same directory or from subdirectories, so that it's generally available from team and family members but not from the wider world. package
items (you don't specify the word package as it's the default) are only accessible to other classes in the same directory, and private
items are only accessible from within the class in which they're defined. (written 2006-09-21)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesJ709 - Java - Class Access 
Where is my Java class? - (2009-09-24) 
When should I use Java, Perl, PHP, or Python? - (2009-12-13) 
What is a universal superclass? Java / Perl / Python / Other OO languages - (2010-11-13) 
Private and Public - and things between - (2011-01-22) 
Accessing variables across subroutine boundaries - Perl, Python, Java and Tcl - (2015-01-18)
Some other Articles
Easy criteria to meetYes, but what do we do now??Making pages clearer - easy Disability Discrimination Act ComplianceWilfred Emmanuel-JonesWho can use which access door?Hotel Exchange RatesEmail metricsJava oversold?Autumn comes to Wiltshire.UNABLE TO ATTEND
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This is a page archived from The Horse's Mouth at
the diary and writings of Graham Ellis.
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