Retiring, March 2020 - sorry, you have missed our final public course.
The Coronavirus situation has lead us to suspend public training - which was on the cards anyway, with no plans to resume
Please ask about private 'maintenance' training for Python, Tcl, Perl, PHP, Lua, etc
Happily continuing private consultancy / programming work
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 
Accessing variables across subroutine boundaries - Perl, Python, Java and Tcl - (2015-01-18) 
Private and Public - and things between - (2011-01-22) 
What is a universal superclass? Java / Perl / Python / Other OO languages - (2010-11-13) 
When should I use Java, Perl, PHP, or Python? - (2009-12-13) 
Where is my Java class? - (2009-09-24)
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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