What is a Java HashMap and how to use it
One of the most effective ways to store and retrieve data in a targeted manner is to use key-value pairs. In Java, you can use the HashMap class to do this. In this tutorial, we explain what a Java HashMap is and how the class works using practical examples. We’ll look at how to…
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How to install Red Hat 8 step by step
RHEL 8 is a very popular and highly recommended Linux distribution for companies. In this article, we will show you how to install this version of Red Hat Enterprise Linux step by step and configure it according to your exact needs. You will also find out which requirements…
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How to use the most common CSS commands
CSS commands work together with HTML to create the look of a website. With CSS, content and design are kept separate. Some commands are used repeatedly and it’s important to incorporate such commands into the code of the CSS file following clean code principles. So which commands…
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How to install Red Hat 9 step by step
Red Hat Enterprise Linux (RHEL) is a widely recognised and trusted Linux platform favoured by businesses worldwide. Installing RHEL 9 is a straightforward process requiring only a few steps. In this article, we will walk you through the installation procedure and will explore the…
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How to install Docker on Red Hat Enterprise Linux 8
The container platform Docker and Red Hat Enterprise Linux 8 are a worthwhile combination for companies. Here we explain how to install Docker on RHEL 8 via repository or manually and how to check the success of the installation afterwards. We also shed light on the exact…
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How to use SQL UNION
If you’re trying to improve the readability of your data, you might want to combine records from different tables into a new target table, without duplicates. Rather than copying records piece by piece into the new table, you can use SQL’s UNION operator. In this tutorial, we…
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How to use the Java method main():
The most important factor in any application written or used with the Java programming language is the Java main() method. After all, it serves as the entry point for every Java program. In this article, we’ll explain exactly what the main() method in Java is, how it works and…
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How to determine the length of an array in C
You can use various methods to determine the length of an array in C. Each approach comes with its own set of advantages and disadvantages. It’s best to let the goals and requirements of your codebase guide you. In this tutorial, we’ll explore the most effective functions for…
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How to remove a character from a string in Python
In Python, there are various ways you can remove and replace unwanted characters from strings. You can use simple loops, list comprehensions, built-in functions like str.replace() and regular expressions. In this article, we’ll take a look at these different approaches, using…
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How to install Docker on Red Hat Enterprise Linux 9
The Docker development platform is ideally suited for Red Hat Enterprise Linux 9. We will explain step by step how to install Docker on RHEL 9. You will not only learn how to install via a repository, but also how to install the container platform manually. Keep reading to find…
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