Git tips and tricks

Git tips and tricks you forgot about Git log with names of branches and tags As default git log doesn’t give you information about branches and tags. If you need such info you must add –decorate argument to git log command, for example:


By | Lipiec 23rd, 2014|Categories: Development, Tips and Tricks|Tags: |0 Comments

Scala – change class’s functionality on the fly with trait

The very interesting feature of traits is possibility is dynamic mixin with other object. Why I’ve named it „dynamic”?. Because you can add trait not only to class but also to instance. It’s powerful feature that can change functionality of a class on the fly. […]

By | Czerwiec 20th, 2014|Categories: Development, Tips and Tricks|Tags: , |0 Comments

Installing Java ME Embedded 8 on the Raspberry Pi

We try to write first Midlet and run it at Raspberry Pi device remotely. You need Raspberry Pi prepared. I’m using recommended OS for Raspberry: Rasbian. It’s debian based linux distribution prepared for this machine. If you work often with the same Pi you should set up static IP. It’s recommended way, you no need find current IP every reboot. You can do this in two ways: in the router, to bind IP with Pi Network Card’s MAC number, or at the Pi network config to retrieve static IP. The article doesn’t cover instalation and using ssh also. If all is prepared we can start. […]

By | Kwiecień 17th, 2014|Categories: Development|Tags: , , , |0 Comments

Preparing for Java ME8

Few days ago Oracle has rolled out Java 8. In my opinion it’s revolutionary release, but it isn’t topic of this article. In parallel we can use new Java ME distribution for embedded platform – Java ME 8. Sadly SDK is at the moment at Early Access state and prepared only for Windows. I’m Mac user, then there is no possibility to check this out without VirtualBox. […]

By | Kwiecień 17th, 2014|Categories: Development|Tags: , , , |0 Comments

Resolve Sudoku puzzle with Choco

Few years ago I was programmer that write my own algorithms for every problem I’ve tried to resolve. One day I asked myself „Is any library that help me to resolve decisions in way, I provide data and conditions and get solution in back?” That day I’ve found Constraint programming. Contraint programming is an emergent software technology for declarative description and effective solving of large, particularly combinatorial, problems especially in areas of planning and scheduling. It represents the most exciting developments in programming languages of the last decade and, not surprisingly, it has recently been identified by the ACM (Association for Computing Machinery) as one of the strategic directions in computer research.(source) […]

By | Luty 24th, 2014|Categories: Development, Tips and Tricks|Tags: , , |1 Comment

Java 8 – Default and static methods in interfaces

Java 8 has a lot of improvements, many of them touch interfaces. The problem is when new release want to add new methods to old interfaces from standard library. Every class implementing that interface should be rewrited to add implementations of missing methods. That’s very big problem – unacceptable in Java. Java 8 provide solution for problem of this kind – default methods. […]

By | Luty 12th, 2014|Categories: Development, Programowanie|Tags: , |0 Comments

Java 8 – Method references

With Lambda expressions Java 8 has new power for developing smart and fast applications. If you don’t know how lambda expressions works just take a look a link above. Sometimes, there is already a method that carries out exactly the action that you’d like to pass on to some other code. For example, suppose you simply want to print the event object whenever a button is clicked. You can use code below:


By | Luty 11th, 2014|Categories: Development, Programowanie|Tags: , , |0 Comments

Java 8’s Lambda expressions

There will be few new features included in Java 8. Lambda expressions are one of them. They provide a concise and clear way to represent method interface using an expression. Labda represents an anonymous function like anonymous classes well known from previous java releases, but with clean and simple syntax. Lambda expression is a block of code with parameters, you can use it whenever you want, a block of code is executed at later point of time. Up to now, giving someone a block of code hasn’t been easy in Java. Java is an object-oriented language, so you had to construct an object belonging to a class that has a method with the desied code. […]

By | Luty 10th, 2014|Categories: Development, Programowanie|Tags: , , |0 Comments

How to keep remote git repository updated

Lately my friend ask me: „I’ve forked repository from, how can I update it?”. I’ll write an answer for this question here. Preparation As example I’ll use Kotlin Language repository from (I like Kotlin and I’m proud of it :)) […]

By | Listopad 24th, 2013|Categories: Development|Tags: , |0 Comments

Tuples in Scala

I Like Tuples in Scala. I’m almost as happy as when I met Ranges in Groovy/Ruby. My main programming language is Java and there aren’t such nice control structures. Then, what is Tuple? Tuple in Scala is part of the Collections API. Tuple combines a fixed number of items together and all can be used as one object. Tuples can hold objects with different types (unlike an array or list) and are immutable. […]

By | Listopad 12th, 2013|Categories: Development|Tags: , |0 Comments