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3049 - Computer Graphics is fun - even if Java Applets are Old Hat
Applets - small applications which include a Graphic User Interface in them - are where Java started ... but they didn't grow as much as other uses of Java and these days they're something of a specialist interest - great for some Intranet applications, but not so common / practical on applications ....

3048 - String handling - from first steps to practical examples
Initial String handling examples on a training course are sometimes a bit mundane - and that's because we have to cover some of the basics like "what is a string" before we start reading them in useful quantities from files, databases, or web resources. But it's important to get those basics under ....

3047 - What is a universal superclass? Java / Perl / Python / Other OO languages
In any object oriented language, all objects will ultimately inherit from a base class supplied with the language, whether it's explicitly stated or not. That's because every class that you write will need that basic facilities to set up members (objects), and it's also useful to provide you with a ....

3046 - Java Beans, tag libraries and JSPs - what and why.
Java Programming - training course! - just completed. We went a long way from the first steps in Java on Monday through to Servlets and Java Server Pages (JSPs) on Friday - and yet in many ways, our course goes full circle. For, through Java Server Pages, you can keep the look and feel of a web si ....

3045 - After Course Resources - do we publish sample answers. Example from Java Exceptions module.
At the end of each module on our courses, there's an exercise for the delegates. It lets them make use of many of the elements they've learned about to consolidate their knowledge. And it helps me evaluate, as they work through the exercise, how they are progressing; I can "mop up" any major eleme ....

3044 - Changing a Servlet - more that just editing and compiling
If you're going to modify a servlet, you'll need to edit and recompile the classes that you're changing - and chances are that will include the main application class. Which means you need to have access to the source. Not a problem if you're a developer of the product, but could be an issue if it ....

3043 - Gathering information - logging - with log4j. First steps.
Generating information about processes as they run - who has visited a server, where orders have been received from, noting which requests have been slow - are all vital elements of debugging and monitoring processes. And this information gathering all comes under the title of "logging". Anyone ....

3042 - Least Common Ancestor - what is it, and a Least Common Ancestor algorithm implemented in Perl
Imagine you have a tree - a series of leaves which join together as you head towards the root into bigger and bigger branches. The "Least Common Ancestor" is the point at which the branches from two leaves you have chosen come together. In computing, such a tree structure is very common - files an ....

3041 - Java - basic rules for arithmetic, variables and conversion
Declare - Initialise - use - the sequence for Java variables • All Java variables must be declared before they are initialised • All Java variables must be initialised to a value before their current value is used So: 1. Declare (i.e. define the type of variable and the name 2. Set an in ....

3040 - Doing several things at the same time - Java threads
If you have a program that you want to do several tasks at the same time, you can use threads (in Java). You create a runnable object through a constructor, start it when you want it to start and stop it when you want it to stop. And it runs in parallel with (in reality time shared with) other thr ....

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