Flattening Stream Collections in Java

Posted on March 1, 2022 by Andrej Buday

This article is about Java 8 stream feature flatMap. If we have a List<List<Object>>, how can we turn the list of lists into a single list that contains all the elements from the lists in the same streamflow using the features of Java 8?

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What does the double star operator mean in Python?

Posted on February 1, 2022 by Andrej Buday

In some Python code, you might spot double stars standing next to each other. What do those two stars mean, and what is their job? We will answer all the questions in this article.

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Selenium – remove html element from the DOM

Posted on January 3, 2022 by Andrej Buday

This article will show you how to remove elements from HTML DOM (Document Object Model) when using automated web-browser framework Selenium. If you want to remove anything you do not want on your site during web-scraping, you came to the right Selenium tutorial.

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How to join List String elements with a comma

Posted on January 1, 2022 by Andrej Buday

This article will show three different ways to print string elements of the list into one coherent text.

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How to convert private key DER to PEM file type

Posted on December 1, 2021 by Andrej Buday

In this article I will show you quick work around how to turn .pem file type into the .der file type on Windows.

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Create PostgreSQL database for integration testing with Docker

Posted on November 1, 2021 by Andrej Buday

In this article, we will explore the idea of creating a PostgreSQL database Dockerfile. We can, for example, use it for creating integration tests in a separate CI/CD workflow.

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How to print current project classpath

Posted on October 3, 2021 by Andrej Buday

Imagine you want to figure out what is the path to your Java compiled classes. For that, you will need to print the classpath. This article is a short explanation of what a classpath is and a single line of Java code that will help you print out your classpath.

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How to calculate median from an array in Java

Posted on October 1, 2021 by Andrej Buday

In this short article, we will see how to compute median in Java.

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How to set custom configuration for your local Git project repository

Posted on July 1, 2021 by Andrej Buday

Suppose you do not want to have the same configuration for your local repository as you have your global Git settings. Or you need to fix identity information for commits that are already made in Git commit history. In that case, this article will show you a few Git commands on how to set up the custom configuration for your local Git repository or how to fix past mistakes.

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Verify method was called n-times with Mockito

Posted on April 3, 2021 by Andrej Buday

This short article will explain how to verify that Mock’ method was called n-times with the help of Mockito testing framework.

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