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Artem Divertitto
Java Generics
18 August 2022 16:06
Java Generics: how to use angled brackets in practice
Generics are Java's special mechanism for implementing generic programming — a way to describe data and algorithms that lets you work with different datatypes without changing the description of the algorithms. The Oracle website has a separate tutorial dedicated to generics: "Lesson: Generics"...
Alex Vypirailenko
Java Classes
18 August 2022 10:58
UML Class Diagram
I think everyone has heard the saying "Measure twice, cut once". It's true advice in programming. It's always better to think about the implementation before you spend any time carrying it out. During implementation, you often need to create classes and think up how they will interact...
Milan Vucic
OOP Java
18 August 2022 8:14
Principles of OOP
Java is an object-oriented language. This means that you need to write Java programs using an object-oriented paradigm. And this paradigm entails using objects and classes in your programs. Let's try using examples to understand what classes and objects are, and how to apply basic OOP principles...
Vasyl Malik
Java Collections
18 August 2022 8:04
Collections in Java
A collection in java is represented as a container that groups all the elements into a single unit. For example, a mail folder (group of emails), a telephone directory (mapping of names to phone numbers)...
CodeGym
Random
17 August 2022 14:01
IT News Digest #28: Apple employees will return to the office under hybrid model; $1.9 billion stolen in crypto hacks so far this year; Chinese internet giants hand algorithm data to government
Last week in the news: JetBrains IntelliJ IDEA 2022.2 uses Java 17 Runtime, Nearly half of all teens say they use the internet “almost constantly.”
Jesse Haniel
OOP Java
17 August 2022 6:22
OOP Principles
Hi! Have you ever wondered why Java is designed exactly as it is? I mean, you declare classes and create objects based on classes, classes have methods, etc. But why is the language structured so that programs consist of classes and objects, and not something else? Why was the concept of an "object" invented...
Lucy Oleschuk
Random
15 August 2022 14:25
The Best Collections of Books and Videos to Strengthen Your Knowledge
According to the TIOBE Index for July 2022, Java is still one of the most popular programming languages in the world despite 25+ years of existence and the appearance of new, fresh programming languages. No wonder...
Artem Divertitto
Design Patterns in Java
15 August 2022 11:47
Java Singleton Class
Hi! Today we'll dive into the details of various design patterns, starting with the singleton pattern. Let's review: what do we know about design patterns in general? Design patterns are best practices that we can apply to solve a number of known problems...
Jesse Haniel
Keywords in Java
15 August 2022 9:23
Java this keyword
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...
Alex Vypirailenko
Strings in Java
15 August 2022 8:15
Java String.split() method
Let's talk about Java's String.split method: what it does and why it is needed. It's not hard to guess that it splits a Java string, but how does this work in practice? Let's dive deep into the operation of the method and discuss some non-obvious details. At the same time, we'll learn how many...
John Selawsky
Java Algorithms
15 August 2022 8:00
Bubble sort Java
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...
Jesse Haniel
Design Patterns in Java
15 August 2022 7:14
Patterns and Singleton in Java
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!
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