IT Sky Consulting GmbH
When Java was created, the concept of operator overloading was already present in C++. I would say that it was generally well done in C++, but it kind of breaks the object oriented polymorphism patterns of C++ and the usual way was to have several overloaded functions to allow for all n² combinations. In the …
„Operator Overloading“ weiterlesen
I just found this usability pearl: After entering a credit card number as usual with spaces between the groups of four digits, the web page complained like this: Yes, it is easy to allow spaces. Just match the following regex /^\s*\d{4}\s*\d{4}\s*\d{4}\s*\d{4}\s*$/ and then remove the spaces when processing it, but do not let the user …
„Usability „Pearl““ weiterlesen
We all know that Java uses a „virtual machine“ that is it simulates a non-existing hardware which is the same independent of the real hardware, thus helping to achieve the well known platform independence of Java. Btw. this is not about virtualization like VMWare, VirtualBox, Qemu, Xen, Docker and similar tools, but about byte code …
„Virtual machines“ weiterlesen
The type system in Java makes a difference between so called „primitives“, which are boolean, byte, char, int, long, float and double and Objects, which are anything derived from Object in object oriented philosophy, including the special case of arrays, which I will not discuss today. Primitive types have many operations that are kind of …
„Primitives, Objects and Autoboxing“ weiterlesen
Dealing with numeric types in Perl is not as strait-forward as in other programming languages. We can use „scalars“ out of the box, but then we get floating point numbers, more precisely what is called „double“ in most programming languages. This is kind of ok for trivial programs, but we should make a deliberate choice …
„Numeric types in Perl“ weiterlesen
Perl 6 has silently reached its first production ready release on Christmas 2015, called v6c. It will be interesting to explore what this language can do, which features it offers and how it compares to existing relevant and interesting languages like Java, C, Ruby, Perl (5), Clojure, Scala, F#, C++, Python, PHP and others in …
Deutsch Strings in Java and many other JVM-languages consist of Unicode content and are encoded as utf-16. It was fantastic to already consider Unicode when introducing Java in the 90es and to make it the only reasonable way to use strings, so there is no temptation to start with a „US-ASCII“-version of a software that …
„UTF-16 Strings in Java“ weiterlesen
I guess for most of us this is more an issue of their private life rather than done professionally, and those woo do this for money should already have answers for everything…. But the IT aspects of this are interesting anyway… So some of us, including me, have hundreds or thousands of photographs that have …
„Scanning, sorting and processing large numbers of photos“ weiterlesen
A few decades ago most programming was performed in Cobol (I do not want to shout it), Fortran, Rexx and some typical main frame languages, that hardly made it to the Linux-, Unix- or MS-Windows-world. They are still present, but mostly used for maintenance and extension of existing software, but less often for writing new …
„Will Java, C, C++ and C# be the new Cobols?“ weiterlesen
Wonderful coincidences have been discovered. The NSA has excellent technological knowledge, especially in the area of storing and processing huge amount of data. And the US government wants to move one step ahead with privatization of state run activities. So the US government and the Oracle corporation have agreed to sell the NSA to Oracle. …
„Oracle buys the NSA“ weiterlesen