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2427 - Operator overloading - redefining addition and other Perl tricks
What does addition actually mean? It means different things depending on what you're adding together, and in Perl you can redefine additions - and other operators - on objects of types which you define. This is known as operator overloading, and there's a complete code example here. So ... how d ....

2426 - Which version of MySQL am I running?
Oh be careful - that is a VERY dangerous question. Do you mean "what version is my MySQL server" or "what version of the mysql client program am I running?" I'll show you how to find answers to both questions. What version is my MySQL server? Use the select command, and run the version function wi ....

2425 - Weekend and Christmas Promotion - Well House Manor Hotel, Melksham
We've been busy at weekends at Well House Manor this summer - a notable increase in business, and this weekend we have returning guests once again, which is always a good sign. But we're conscious that, as autumn comes, fewer people will be coming to the area for holidays and weddings and we should ....

2424 - A Winter Weekend Special at Well House Manor
Keywords ... Hotel ... Melksham ... Wiltshire ... Weekend Break ... Christmas ... Visiting Bath ... En-suite ... Luxury Rooms Stay with us for 2 or more nights (including a Friday or Saturday night) from October to February, or for any 2 or more nights over Christmas and the New Year (23rd December ....

2423 - What is a JVM, a JRE, a JDK - components of the core Java Environment
Your Java class files run on a JVM - a "Java Virtual Machine" which is a program that reads the instructions in the (binary) class file and performs them. Although the class files are "architecture independent" - in other words, the same class file will work on an Intel and a PowerPC chip, and on Li ....

2422 - Looking inside Java classes - javap and javadoc
javap is a program that looks inside a Java class and reports on all the methods and variables that are exposed by that class ... so it's looking at a Java class's object format. javadoc is a program that analyses Java source code and reports on all the methods that are exposed by that class. java ....

2421 - Sorting Collections of Objects in Java
The examples that I wrote / finished yesterday ended up with a program called "Zoe" in Java, which read all the records in an access log file, created an object for each of them (which, sensibly would have been called a Hit but we called a "Zoe"), and reported on that object creation. To finish off ....

2420 - Exceptions in Java - why and how
Although it's common practise to include a static main test program in a class, it's something that newcomers can have some difficulty following ... so we don't do it too early on the course - we keep classes and programs that use those classes (even if they are just test programs) each in their own ....

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: ....

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