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2419 - Where is my Java class?
Exception in thread "main" java.lang.NoClassDefFoundError: Gerald OK - so where did Java look, and where should it have looked? Java looks for classes in each of the locations in the CLASSPATH environment variable in turn - each of those locations being either a directory or a .jar file which cont ....

2418 - Viv.java uses unchecked or unsafe operations - explanation and cure
Are you getting Java compiler messages like this? Dorothy-2:java grahamellis$ javac Viv.java Note: Viv.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. Dorothy-2:java grahamellis$ javac -Xlint Viv.java Which when you expand the warning with -Xlint gives: ....

2417 - Java Programming Fundamentals
Java Programming Fundamentals - sample programs from "hello world" through to objects, inheritance, arrays, packages and utility classes! This week, I'm running a small Learning to Program in Java course ... and I have taken advantage of the small group size to write a co-herent series of new examp ....

2416 - Automating access to a page obscured behind a holding page
Question: "I have a web page that I visit which sends me an initial response to say that it's working on the results, and then the results appear a few seconds later. I want to use an automed process / program on my computer to visit this page and store the final results, rather than having to acce ....

2415 - Variable names like i and j - why?
Q: Why do people use variable names like "i" and "j" for loop counters? I thought that you were supposed to use longer, desciptive names! A1: Fortran (FORmula TRANslator) was one of the prevalent programming languages in the 1960s and 1970s, at a time when many programming techniques, algorithms an ....

2414 - Hello World - a good traditional start to a Java course
All programming courses, it seems, start with a "Hello World" program. It's almost a tradition and while I'm not one of those people who follows traditions just for their sake, traditions usually are founded on good reason. This one is, and we follow it! When you come new to a programming language ....

2413 - Sanity checking the price, and selling up to increase income
"Does that LOOK right?" It's a question I always ask myself before I present a critical piece of information - such as a bill - to someone. The sanity checking in this was is something which was taught to me (and taught well, because it has stuck and is useful) many years ago when learning to use ....

2412 - Autumn Fruits and Bristol Old Station
Where can we go today? There's a wide choice of places on offer ... ... some of which have a chequered and interesting history (and those of you who know something about your history of Bristol will recognise that this covered car park was once the gateway to the City But it's autumn, and i ....

2411 - Further North - long summer days and lovely countryside
I live further north than the city of Moose Jaw, Saskatchewan at 50°37' [Latitude]. And much further north than Ottawa, where I was cautioned against walking 400 yards to a restaurant in deep winter because of the bitter cold. Ottawa is at 45°24'. Where I live is 51°32' North. Living ....

2410 - Removal of technical resources from this site
"Will you ever be removing any of these resources?" A question asked in all seriousness by a delegate on the course I was concluding in Friday, as he looked through the huge range of pages we have here. I'm not a politician, so I can answer a question simply - the answer is "No - I can't see circ ....

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