Oleksandr Miadelets Head of Developers Team at CodeGym

Oleksandr became interested in programming at school, and he wrote games. Later, this hobby grew into professional development. After many companies, Oleksandr joined CodeGym in 2014. First, he wrote tasks for the course, later he moved to the backend, and then he became a leader of the development team.

Author's articles

- 17 May 2022 13:56Java program to check palindrome stringSome problems in programming have the status of classic ones. Typically, such tasks are related to mathematics and they are very fond of asking students of Computer Science specialties, as well as job seekers at interviews...
17.05.2022 604views 0comments

2 - 24 January 2022 12:22IntelliJ IDEA: Coding style and code formattingA programming language is very similar to a spoken language. The only difference is that it is a special language whose main purpose is to facilitate communication with a computer in order to explain to the computer what we want it to do. But you can't have a personal conversation with a computer...
24.01.2022 10396views 0comments

6 - 24 December 2021 10:50Java BigInteger ClassThere are some primitive data types in Java that are used, such as int or long, to perform integer operations. However, sometimes we need to store large numbers outside the scope of such primitive data types. BigInteger Class is used...
24.12.2021 601views 0comments

2 - 28 October 2021 11:00Java Object getClass() MethodWhat is Java Object getClass() Method? Java uses a method called getClass() provided by the class object to get the class of any object used. The method does not take any parameter and is called upon the object whose class needs to be fetched....
28.10.2021 585views 0comments

3 - 22 April 2021 7:51How to Check if a File Exists in JavaIn this brief article, we’re going to look into the most basic ways available in Java to check if a file exists at a predefined address or not. Why do we need to check if a file “exists?” While dealing with file operations (read/write/create/delete/update etc), many newbies can wonder why do we even need to check if a file exists?...
22.04.2021 1408views 0comments

2 - 10 December 2020 7:00Java hashCode()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”...
10.12.2020 13269views 0comments

9 - 20 October 2020 12:09Java.lang.Math.max() MethodJava Math class contains the methods required to do mathematical calculations. One of the very common calculations we need is finding the maximum of two numbers. For this task, java has introduced a java.lang.Math.max() method. There are a few key things to know about...
20.10.2020 3726views 0comments

3 - 5 October 2020 12:14Matrix in Java - 2D Arrays“A matrix is a collection of numbers arranged into a fixed number of rows and columns.” Usually these are real numbers. In general, matrices can contain complex numbers but for the sake of simplicity we will only use whole numbers here. Let’s have a look at what a matrix looks like...
05.10.2020 34895views 0comments

4 - 9 September 2020 10:45Min Heap in Java with ExamplesBefore we get started, it is assumed that you know about a Binary Tree (in a binary tree, each node stores a key greater than all the keys in its left subtree and less than all the keys in its right subtree). Whereas, a Binary Heap is a complete binary tree which satisfies either the min-heap or max-heap ordering property...
09.09.2020 28900views 3comments

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