Code Puzzle – Get Behind Firewall

Hi, today I have very nice code puzzle for you. Code Puzzle is to implement two blue boxes in following diagram. That can be implemented in Java and/or C# with following requirements. The only system that can receive connections is behind green box that is a open server endpoint. The system behind red box is closed and you cannot connect to it. I have very special prize for the best, clean and easiest solution of this code Continue ReadingCode Puzzle – Get Behind Firewall

Java 8 SE Programmer I

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 very good instructor lead training and I learn about 6 hours a day on that training and then about 5 hours later on the evenings 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 Continue ReadingJava 8 SE Programmer I

Batch Processing Aspect in Java

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 that is fully asynchronous and in Java I made aspect that does sync invocations from many threads. I have in my mind uses of this aspect to web application or web api or web service implementation that has static controller field for example named “batchProcessingAspect” and invokes Continue ReadingBatch Processing Aspect in Java

Action<T> and Func<T, TResult> in Java 8

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 to the OCA certification and I had idea that I can use lambda expression and implement simple equivalents of C# delegates in the Java 8. Below you can find implementation with test cases. I found that the code can be very easy, because lambda expressions works as a anonymous Continue ReadingAction<T> and Func<T, TResult> in Java 8

Learn Java so Far so Good Java 1D Array

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

Learn Java proof at Hacker Rank in Tag Content Extractor

Hi, some time ago I started learn Java language. I ma trying to self-study learn of the 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 nice code puzzle solution named Tag Content Extractor. It take me some time. I started learn Java from very easy puzzles and every next one is more and more Continue ReadingLearn Java proof at Hacker Rank in Tag Content Extractor