Articles

This article is aimed at anyone who, for the first time, is encountering the concept of design patterns, has heard the term singleton, or somehow implemented the singleton pattern but didn't understand what was happening. Welcome!

Java’s BufferedReader class reads text from a stream of symbols, buffering the symbols to efficiently read characters, arrays, and strings. You can pass the buffer size to the constructor as a second argument. Here's an example of using the BufferedReader and BufferedWriter classes...

In this article we are going to discuss converting int (primitive type) and Object type (wrapper) Integer to String and vice versa. There are many ways to do it in Java. Convert by adding an empty string. The easiest way to convert int to String is very simple. Just add to int or Integer an empty string "" and you’ll get your...

Once Mark Zuckerberg noted that computers are really good in a repetition of commands. It is not simple for a human being, we are getting tired of repetitions the same thing many times in a row, but a computer can do it millions and billions of times and never get bored. If you try to send greetings to all Facebook users...

In this article the bubble sort algorithm is described. It is the easiest sorting algorithm to learn, so every software developer knows it. This algorithm is usually used for learning purposes or you may get it as a task in your Java Junior Interview. Bubble sort algorithm is very easy to understand, however it is not...

Get Programming with Java. Great book for beginners with a lot of code examples and clear explanations.

We have great news! We've launched a new "Games" section on CodeGym. It's now open to all users. Each of you can write a full-fledged game here, with graphics, and feel like a real game developer. This section is currently in beta testing, so it's very important for us to hear your opinion on how to make it even cooler!

"Games" from CodeGym is a new section with big tasks that involve writing popular computer games. They are easier to create than it seems: each project is divided into twenty subtasks. Completing tasks step by step, you'll write your own game, and then you can add unique features and share it with friends.

"Games" from CodeGym is a new section with large interesting tasks where you create your own versions of popular games. It's simple: each game project is divided into subtasks. Complete them one by one and the game is done. You can share it on social networks and invite your friends to play.

In the "Games" section on CodeGym, you'll find exciting projects that involve writing popular computer games. Want to create your own version of the popular games 2048, Minesweeper, Snake, and other games? It's simple. We've turned game writing into a step-by-step process.

On CodeGym, students are introduced to the this keyword literally from the first lessons. Over time, its meaning becomes clear. But looking back, many people probably admit to themselves that for a long time they couldn't understand the Zen of this keyword. This article will pull back the curtain covering the secrets...

Everyday life is full of situations that we don't anticipate. For example, you get up for work in the morning and look for your phone charger, but you can't find it anywhere. You go to the bathroom to shower only to discover that the pipes are frozen. You get in your car, but it won't start...