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Scala Wonderland: The functional style

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Scala encourages to use a functional style of programming. For programmers coming from imperative world of Java or C# it is the main challenge. The first step is to recognize the difference between functional and imperative programming. Scala has two keywords for variable declaration: var – mutable variables val – immutable variables One sign of imperative sign is occurence of ...

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How to Prevent Crying During Your Technical Interview

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A recent blog post Technical Interviews Make Me Cry by Pamela Fox tells the personal tale of a technologist and conference speaker who gets a Skype/Stypi interview for her dream job, becomes stumped on a technical question, breaks down in tears, almost abandons the interview, fights through it, and eventually gets the job.  Everyone loves a happy ending, and it ...

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Top 10 Questions of Java Strings

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The following are top 10 frequently asked questions about Java Strings. 1. How to compare strings? Use “==” or use equals()? In brief, “==” tests if references are equal and equals() tests if values are equal. Unless you want to check if two strings are the same object, you should always use equals(). It would be better if you know ...

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My Favorite Online Resources for Advanced Java Developers

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The ProgramCreek.com blog has recently featured two interesting posts targeted at “advanced” Java developers: Top 10 Books For Advanced Level Java Developers and Top 10 Websites for Advanced Level Java Developers. These posts highlight resources that are especially beneficial to more experienced Java developers. I generally cannot argue with the lists as all the resources listed are useful to Java ...

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Android Sensor Tutorial: Barometer Sensor

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One of the most interesting topics in my opinion is how to use Sensor in Android. Nowadays our smartphone are full of sensors and we can use it to control somehow our app. The most common sensors are: GPS Proximity sensor Light sensor Temperature sensor Barometer sensor NFC just to mention some of them. In this post we will explain ...

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Scalable Counters For Multi Core

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Counters are required everywhere , for e.g. to find key KPI of application, load on application, total number of request served, some KPI for finding throughput of application & many more. With all these requirement complexity of concurrency is also added & that makes this problem interesting. How to implement concurrent counter     Synchronized – This was the only ...

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Funny Video – Java vs. .NET parody

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Hello fellow geeks, As you might have noticed, we are quite keen on humour here at Java Code Geeks. We believe that a break for some good laughs goes a long way and thus it is always welcome. For that reason, we have featured in the past a list of funny source code comments and some short videos depicting the ...

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Three exciting Lucene features in one day

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Yesterday was a productive day: suddenly, there are three exciting new features coming to Lucene. Expressions module The first feature, committed yesterday, is the new expressions module. This allows you to define a dynamic field for sorting, using an arbitrary String expression. There is builtin support for parsing JavaScript, but the parser is pluggable if you want to create your ...

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MongoDB and Web applications

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Today’s era is when data grows at very huge scale. Data storage is not a problem, yes but the way it gets structured and stored may increase or decrease the seek time for needed data blocks. Use Cases of ever increasing unstructured data           Facebook: 750 million users are active , 1 in 3 Internet users ...

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