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Stacks and Queues in Java


I have been working on some Java code recently that required both a stack and a queue. The choices to use aren’t immediately obvious. There is a Queue interface, but no clear concrete implementation to use. There is also a Stack class, but the javadocs point out that other classes “should be used in preference to this class”. So, what ...

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The Significance of HTML5


HTML5 is important for three reasons. And its importance starts with the end of browser plugins. That’s right. With HTML5, rich media aspects that were formally handled by plugins (think Flash), are now built-in. That’s why there are new media tags like <audio> and <video>. Think about it for a second – when’s the last time you visited a site ...

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Android Augmented Reality


Introduction “Augmented reality (AR) is a live, direct or indirect, view of a physical, real-world environment whose elements are augmented (or supplemented) by computer-generated sensory input such as sound, video, graphics or GPS data.” – Wikipedia Basically, Augmented Reality provides extra information over real-world object or place. For example, watch this video Augmented Reality is a combination of two technologies: Computer ...

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Coarse-grained benchmarking


While developing our software, we are all about metrics – even to the fact where I am pretty sure at least 10% of our posts contain a phrase “measure don’t guess”. One of those metrics we keep a close watch for is performance. Or to be more precise – the amount of extra CPU cycles we burn or the extra ...

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#NoProjects – why projects don’t make sense


In the last few months Steve Smith, myself and others have been Tweeting a lot with the hash tag #NoProjects. We have independently come to believe Projects are a smell, they are bad for our industry (the technology industry). Steve set out his thinking and now it is my turn. Right now this is little more than a bullet point ...

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The 10 Most Popular DB Engines (SQL and NoSQL)


How to objectively measure the popularity of a DB engine? Good question! And there’s an Austrian company (Solid IT) who claims to have the answer. The company focuses on “Big Data und NoSQL”, but this focus does not seem to have biased the result of the measurement. Among the top 10 database engines, there is only MongoDB, which is not ...

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Unique hashCodes is not enough to avoid collisions


There is a common misconception that if you have unique hashCode() you won’t have collisions.  While unique, or almost unique, hashCodes are good, this is not the end of the story. The problem is that the size of a HashMap is not unlimited (or at least 2^32 in size)  This means the hashCode() number has to be reduced to a ...

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The Premature Return to SQL


In online communities, the NoSQL topic (much like the ORM topic) is a guarantee to stir emotions. Many emotions are stirred by evangelists on either side for ideological or marketing reasons. Here’s an interesting post by Alex Popescu, a passionate NoSQL and polyglot persistence evangelist, claiming that the recent trend to return to SQL is premature:         ...

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