There are two ways for developing services using JAX-WS, service first, and contract first. Service first means you would typically write the implementation first and generate the WSDL afterwards, whereas contract first you would define the WSDL first, then write the implementation afterwards. There are pros and cons for each approach, but I won’t dwell […]
Tag: java
Updating Java on a Mac is easy, it’s just a case of installing a new JDK and recreating the symbolic link that is used to point to the current JDK. Download the Java .dmg for mac from the Oracle website, then run through the installer. That will install Java for you, but your default Java […]
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, … By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the […]
Categories
Robots! (part 1)
Inspired by the android controlled lego robots I saw at DroidCon UK this year, and with difficulty finding a use for my raspberry pi, I’ve decided to have a go at building a robot that I can control via an android app. Having a 24 hour flight home from Australia at the weekend, I’ve had […]
Categories
How I passed the SCJP / OCPJP
After procrastinating for many years (4 to be precise), I finally sat and passed the SCJP exam. The exam itself wasn’t particularly difficult, but theres a lot of things you can get tested on that you’ll rarely use in everyday development. Having been developing in Java for around 4 years now, I’ve never needed to […]
Looping constructs are very useful in any programming language, however they can be come particularly complex when you have a variety of nested loops and you need to drop out from particular iterations, or exit the loops entirely under a set of given circumstances. Fortunately for us, Java provides us with 2 keywords that we can use […]
Inheritance is a practice of one thing extending another. So you can more specific subclasses of a class. Inheritance is available in most programming languages, and in Java it is implied using the extends keyword. For example, you may have several objects like Car, Boat, Truck, these may all have common behaviour and state between […]
Encapsulation is a fantastic OOP concept of being able to shield class state via the use of accessor methods. Imagine that you have a class, perhaps called Person. This class will have some form of state, such as name, age, date of birth. These would most likely be stored against reference variables. If you left […]
There are times when developing, when you need to do similar behaviour but with differing input arguments, for example you may have a method that prints something to the console. You may need to print Strings, Integers, and all sorts of other objects. You could (if you really wanted), create a method for each one […]
If statements are great, but sometimes they are just not very practical when you have to test for more than a handful of conditions, have a look at this very poor example of how you build up a long set of if-else statements, its fine for a few checks, but if you’re doing multiple equality […]