Category Archives: Java

Code Puzzle – Get Behind Firewall

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Hi, I have a very nice code puzzle for you today. Code Puzzle is to implement two blue boxes in the following diagram. That can be implemented in Java and/or C# with the following requirements. The only system that can receive connections is behind the green box, which is an open server endpoint. The system behind the red box is closed, and you cannot connect to it. I have an extraordinary prize for this code puzzle’s best, clean and easiest solution. The prize is “Prize: Code Puzzle – Get Behind Firewall,” titled 200×200 pixel link image that I put below Continue ReadingCode Puzzle – Get Behind Firewall→

Java 8 SE Programmer I

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Hi, Today I am proud to announce that I pass Yesterday my first Java exam. It is Java 8 SE Programmer I exam 1Z0-808. I was on excellent instructor lead training, and I learned about 6 hours a day on that training and then about 5 hours later in the evenings the entire week. My result score could be better. On some questions, I simply could not find the exact correct answer, and in 77 test questions, I failed about 6 questions, so my score was 91%. I know it is not bad, but after about a half year of Continue ReadingJava 8 SE Programmer I→

Batch Processing Aspect in Java

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Hi, today I made port of my Batch Processing Aspect in Java. It is quite a bit different aspect than I made previously in C#. In C#, I made something fully asynchronous, and in Java, I made an aspect that syncs invocations from many threads. I have in my mind uses of this aspect in web applications or web API or web service implementation with a static controller field, for example, named “batchProcessingAspect” and invokes changes in the database in sync. However, the aspect makes processing the database request and transforms them into batches. Most of the solution is a Continue ReadingBatch Processing Aspect in Java→

Action and Func in Java 8

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Hi, as a .NET/C# coder I found the issue that there is not Action<T> and Func<T, TResult> equivalents in Java environment. I am self-study this to prepare myself for the OCA certification, and I had the idea that I could use lambda expression and implement simple equivalents of C# delegates in Java 8. Below you can find implementation with test cases. I found that the code can be straightforward because lambda expressions work as anonymous methods in C#. Moreover, use T as an internal class of method. You can have an entity available inside the lambda and outside, too, so Continue ReadingAction and Func in Java 8→

Learn Java so Far so Good Java 1D Array

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Hi, I am happy to announce, that my learn Java journey at the Hacker Rank is going very nice. Today I was pleased to solve the code puzzle named Java 1D Array (Part 2), and this puzzle already has a 39.64% success rate. And its category of Data Structure Challenges, most of the code puzzles have more than a 90% success rate. So far, so good. I have 313 points in Java and a 2067 rank :). I have to say that Java is cool. I am solving Hacker Rank puzzles in Java 7, I decided to start to prepare Continue ReadingLearn Java so Far so Good Java 1D Array→

Learn Java proof at Hacker Rank in Tag Content Extractor

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Hi, some time ago I started learn Java language. I am trying to self-study and learn Java. And I have to say that the language is very nice, and with deep knowledge of C#, my progress is fast. I want to show you today here one of the nice code puzzle solutions named Tag Content Extractor. It takes me some time. I started learning Java from straightforward puzzles, and every next one became more and more complicated. Also, I am thinking about Java certification. However, it is not a must because I get the lesson that certification in .NET, even Continue ReadingLearn Java proof at Hacker Rank in Tag Content Extractor→