Developer Notes 001

This article selects a few developer notes collected during the software development, which were unfortunately not enough for a self-standing article.

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How To Turn Number To String With Padded Space or Zeroes

This article will show us how to turn numbers into the String with padded space or numbers.

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Flattening Stream Collections in Java

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?

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

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

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

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

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

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

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

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