Notes on practical usage of Java 8 stream filtering. Stream Filtering A Stream<T> references a sequence of T values, and exposes a set of aggregate operations we can use to manipulate data in a pipeline. As an example, we can find the name of any people older than 20. In java, you can loop Read more…
Here are some notes on parsing XML file with java to extract information Simple Example Assume we have an XML file and we want to extract specific attributes. A sample file could be: With XMLStreamReder Here is the code to quickly scan the XML file and get the values for Read more…
This page presents a few examples of using Java for passwords and hashing. Generate Password A Java example to generate a random password containing only alphanumeric characters. Java Code to ComputeSHA-512 digest other.. linux get sha-512/
Here are a few notes on how to run a simple java REST service and return JSON data as a response REST service to do provide data on products REST with jax-rs using Jersey We start creating a StoreContent class representing the products in an online store. Then, we add Read more…
Knowledge of algorithms and data structures is important for Software Engineers. To be good at solving problems you need practice. Here is some resource to make practice, and suggestions. Posts about Algorithms Below, you see the list of my posts about algorithms [catlist name=”algorithms”] Sites Sites to practice and learn Read more…
Hey, I’m Patrik! I’m a Senior Java Software Engineer with experience working for big IT companies around Europe (IT, NL, CH, DE). I’m really into Java backend development, and I also work with Python, TypeScript, SQL, HTML, and Bash for automation and full-stack projects. I have a solid grasp of Read more…
I often travel for work, and a few times happened I wasn’t able to access my VPS via SSH on a working internet connection. So I wrote this article to help me remember how to ssh everywhere. SSH Behind Firewall In my case, I was not able to use ssh Read more…
This article provides a quick intro on how to set up an Oracle DB development environment on mac, Including installing the PL/SQL Developer tool and running Oracle XE on Docker. Tools To set up an Oracle development environment on mac, we need to 1. Install the PL/SQL developer and 2. Read more…
Generics Generics were introduced in java 5 to add stability to the code. You can add type variables to classes, interfaces and methods. Generic Class Declaration Below you see an example of generic class declaration. by writing class Box<T>, you introduce the type parameter T, that can be used anywhere in the class. Read more…
In Bug 514458, I added the “Theme” dynamic menu to the Eclipse IDE. This post explains how I did this. Menu Eclipse 3.x style First edit the plugin.xml, and add a menu contribution. With the locationURI menu:org.eclipse.ui.appearance?after=org.eclipse.ui.window.appearance.separator1, you’ll contribute a submenu to the Window > Appearance menu, just after the Read more…