Published on 30 Jan 2005
Although java.lang.Object declares and implements a method finalize() which is meant to be called by the garbage collector to allow the object to gain control one last time to free resources and finish sanely, I found out in a rather painful way that finalize() will only be called by the garbage collector and not when exiting the program. This means that all the objects that have been in use shortly before shutdown of the virtual machine do not get the chance to close sanely.
Published on 30 Jan 2005
To ensure that URLs can be displayed regardless of the locale, special characters are substituted by a percent sign followed by their two digit hexadecimal equivalent.
Published on 30 Jan 2005
Regular expressions can easily be documented which is demonstrated in the following example matching floating point numbers:
Published on 30 Jan 2005
In one of my projects I needed to process XML files with document type definitions (DTD). The first couple of attempt failed miserably. But after some research I managed to cope:
Published on 30 Jan 2005
In addition to the commonly known properties of a statistic, a special analysis of the data can be performed based on the type of the individual values:
Published on 30 Jan 2005
The internal variable INPUT_RECORD_SEPARATOR determines which string of characters closes a line of input data.
Published on 30 Jan 2005
Although regular expressions are a complex but extremely useful tool for the analysis of strings, they are based on fuzzy logic and, therefore, have high computational demands. Although there can be no universal statement, some rules of thumb can be compiled to support a case-to-case decision whether simple string analysis based on index(), substr(), chr() and ord() is able to improve the time complexity of a perl script with respect to regular expressions.
Published on 30 Jan 2005
The xmessage that comes with Xorg (or XFree) displays a customizable message box. Although its set of features is extended by the gxmessage command, the following listing applies to both command:
Published on 30 Jan 2005
The internal commands pack and unpack have been the source of much confusion, therefore, I will shortly present typical scenarios when to use pack and unpack.
Published on 30 Jan 2005
Instead of publishing subversion repositories via its integration in the apache web server, you can use the svnserve daemon which run on port 3690 by default (but can be used with an inetd).