Articles

Hi! Today we will introduce another data format called XML. This is a very important topic. When working on real Java applications, you will almost certainly encounter XML-related tasks. In Java development, this format is used almost universally (we will find out why below), so I recommend...

Hi! Today we'll consider a rather interesting topic: RMI. This stands for Remote Method Invocation. You can use RMI to allow two programs to communicate with each other, even if they are on different computers. Does that sound cool? :) And it's not so difficult to do! In today's lesson, we'll analyze the elements of the RMI...

First of all, before we define Java hashcode, we need to understand what is hashing and what is it for. Hashing is a process of applying a hash function to some data. A hash function is just a mathematical function. Don’t worry about this! “Mathematical” is not always means “complicated”...

So, you've decided to become a Java programmer. A reasonable question immediately arises: "Where should you start?" In this article, we'll talk about how to learn programming from scratch on CodeGym. We will explore the features of the course, how the learning process is divided into stages...

Hi! Today we will consider a rather important and interesting topic: the creation of dynamic proxy classes in Java. It's not very simple, so we'll try to figure it out using examples :) So, the most important question: what are dynamic proxies and what are they for?

Hi! We continue to explore the topic of nested classes in Java. In the last exercise, we spoke about non-static nested classes, which are also known as inner classes. Today we move on to another group of classes. We'll consider static nested classes. How are they different from other classes?

Java has this keyword — final. It can be applied to classes, methods, variables (including method parameters). For a class, the final keyword means that the class cannot have subclasses, i.e. inheritance is forbidden... This is useful when creating immutable (unchangeable) objects. For example...

When everyone in my grade planned to become a programmer, succumbing to my romantic ideas about the medical profession, I decided to become a doctor. The fact that my family couldn't afford a computer back in 2001 played a non-trivial role in the decision. Computer science lessons were clearly not enough...

Different data structures are created for different purposes. You may know about ArrayList (if still not, we recommend you to read about it first). In this article, we are going to learn about LinkedList and to realize what this collection is good for. If you look into LinkedList Java 8 (or later version of the language)...

If you're someone who hasn't yet decided where to apply your Java knowledge, then this article is definitely for you. The article explores Android development as one possibility. It's the story of how I became an Android developer...

As you know, our habits are second nature. And once you get used to writing for (int i = 0; i <......), no part of you wants to have to relearn this construct (especially since it is quite simple and understandable). However, loops are often...

Cześć! Pozdrowienia dla wszystkich studentów Javy w Polsce! Jeśli jesteś w CodeGym nowy/a, to pozwól nam opowiedzieć parę słów o kursie i dostarczyć więcej informacji o aktualizacjach polskiej wersji. CodeGym zostało...