How to Checkout a Specific Tag in Git
Here is a quick tip which shows how to checkout a specific tag in Git. $ git clone <repository-link> $ git checkout tags/<tag-name> -b <branch-name>The first command clones the whole...
View ArticleClone a Git Repository Into a Specific Folder
Let's take a look at a sample git repository URL:https://github.com/apolunin/java8-impatientIt can be cloned via the following command:git clone https://github.com/apolunin/java8-impatientThe contents...
View ArticleChange File Type in Vim
Recently I had to write a few lines of code in assembly language. Vim and GAS were chosen as suitable tools to use. I downloaded vim-gas plugin, installed it using vim-plug (Vim plugin manager that I...
View ArticleConvert InputStream to String in Java
Sometimes in Java world it is necessary to convert an InputStream to a String for further processing. There are several ways to do it, but here is a fantastic trick I recently discovered in this...
View ArticleCreate a GUID in Java
Some software development tasks need a way to generate unique identifiers. I saw several homegrown solutions, but Java 5 makes the process a breeze. It contains class UUID which can generate type 4...
View ArticleChange Editor for Git Commit Messages
Git is a very powerful tool especially when used from a console. Obviously committing changes is a pretty common task which includes editing commit messages. If a message is short it is easy to specify...
View ArticleRename a Remote Branch in Git
In the previous post I described how to rename a local branch in Git. Now let's take a look how to rename a remote branch. The process is a bit more complicated than with a local one and consists of...
View ArticleRename a Local Branch in Git
From time to time I have typos crept in the names of Git branches I create. Certainly it is possible to delete a branch and create a new one with corrected name. However Git allows for combining two...
View ArticleHow to Avoid Null Checks in Java
I suppose every Java developer wrote checks similar to the following many times:if (obj != null) { // ... obj.doSomething(); // ...}Sometimes such code seems reasonable and its usage can be justified....
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Create Web Application with Maven (Tomcat, WAR File)
This post is a step-by-step tutorial which shows how to create a simple Java webapp project using Maven - a popular Java build tool. The project will be packaged into a WAR file and deployed to a local...
View ArticleTomcat Administrator Login and Password
Tomcat web server has several web applications bundled with it which supply nice GUI to perform administrative tasks. In order to access them you need to authenticate with login and password. Where to...
View ArticleEuclid's Algorithm in Java and Scala
Euclid's algorithm (a.k.a. Euclidean algorithm) is an efficient way of finding the greatest common divisor (gcd) of two numbers - the largest positive integer that divides both numbers without a...
View ArticleLRU Cache in Java - Part 2
IntroductionIn the previous post I described LRU cache notion and showed how it can be easily implemented using LinkedHashMap data structure. But sometimes there is a requirement to implement LRU cache...
View ArticleLRU Cache in Java - Part 1
IntroductionCaching is an optimization technique which can dramatically boost application performance when used appropriately. There are a lot of different approaches to implement caching ranging from...
View ArticleSecret Way of Returning Array from Method in Java
IntroductionThis post is like a little travel in time. It is quite short and doesn't bring a lot of practical sense, but rather a small historical trick that was known better in the early days of Java....
View ArticleJava 7 try-with-resources Statement
Introduction One of the most exciting features added in Java 7 is automatic resource management (a.k.a. try-with-resources or TWR). While basic TWR usage looks simple and straightforward there are...
View ArticleMystery of Collections.max() Declaration
Introduction I'm sure that every software developer who used Java for a while knows about Collections utility class. It contains a lot of useful methods which facilitate collection sorting, finding...
View ArticleGet and Put Principle in Java Generics
Introduction It is hard to imagine modern Java development without using generics. While they look more simple and straightforward than C++ templates, it makes sense to invest some time to learn their...
View Article"Observer" Design Pattern in Java
IntroductionThe Java Platform used to have support for Observer design pattern in the form of Observer interface and Observable class starting from its initial release. However a long time passed since...
View Article"Singleton" Design Pattern in Java
Introduction Singleton design pattern is a very disputable issue. There are tons of discussions in the Internet about Singleton usage in application design, why to use it, why not to use it, why...
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