The term ‘wrapper’ gets thrown around a lot. Generally its used to describe a class which contains an instance of another class, but which does not directly expose that instance. The wrapper’s main purpose is to provide a ‘different’ way to use wrapped object (perhaps the wrapper provides a simpler interface, or adds some functionality). … Read more
A magic number is a direct usage of a number in the code. For example, if you have (in Java): public class Foo { public void setPassword(String password) { // don’t do this if (password.length() > 7) { throw new InvalidArgumentException(“password”); } } } This should be refactored to: public class Foo { public static … Read more
To me, a more modern example of spaghetti code is when you have 20 dlls and every DLL references each other in one way or another. Your dependency graph looks like a huge blob, and your code hops all over the place with no real order. Everything is inter-dependent.
There is almost no difference. In fact the there is an old saying about closures and objects. Closures are the poor man’s object, and objects are the poor man’s closure. Both are equally powerful in terms of what they can do. We are only arguing over expressiveness. In Java we are modeling closures with Anonymous … Read more
“Instance” usually – “instance methods”, “instance variables” etc. Non-static works too, if you find that simpler. I’m not sure I’d really put all those regions in though…
From the official Sun glossary: deprecation: Refers to a class, interface, constructor, method or field that is no longer recommended, and may cease to exist in a future version. From the how-and-when to deprecate guide: You may have heard the term, “self-deprecating humor,” or humor that minimizes the speaker’s importance. A deprecated class or method … Read more
Well, ducking simply means to lower your head in order to avoid being hit or seen. In this case, ‘duck an exception’ just means avoiding your code from getting hit by an exception. For your method not to be hit by exception, you throw it further up the call stack by declaring a throws exception … Read more
Genetic algorithms (GA) are search algorithms that mimic the process of natural evolution, where each individual is a candidate solution: individuals are generally “raw data” (in whatever encoding format has been defined). Genetic programming (GP) is considered a special case of GA, where each individual is a computer program (not just “raw data”). GP explore … Read more
Contrary to most answers, I do not believe that “presently unneeded functionality” is over-engineering; or it is the least problematic form. Like you said, the worst kind of over-engineering is usually committed in the name of future-proofing and extensibility – and achieves the exact opposite: Empty layers of abstraction that are at best unnecessary and … Read more
A session is just a result of a successful connection. Any MySQL client requires some connection settings to establish a connection and after the connection has been established it acquires a connection id (thread id) and some context which is called session.