Articles

Here we are going to discuss the Java Queue interface. You’ll find out what Queue data structure is, how it is represented in Java, what methods are the most important for all queues. Also, what implementations of Queue are in Java language. After that, we take a closer look at the most important...

In this article we learn a priority queue, Java class, that implements Queue interface. What does a programmer know of regular Queue Interface? First of all, this interface is based on the FIFO principle or “first in first out”. That reminds a regular queue in its common meaning. You want to get coffee from McDrive?

So how long does it take to learn Java? Ten years, ten weeks, or one day? Maybe your whole life? You may find very peculiar answers to this question on some online forums. Let’s make it clear from the very beginning. In this article “to know Java” doesn’t mean you can write “Hello world program”...

Hi! Today's lesson will be slightly different from the rest. It will differ in that it is only indirectly related to Java. That said, this topic is very important for every programmer. We're going to talk about algorithms. What is an algorithm? In simple terms, it is some sequence of actions that must be completed...

CodeGym articles often talk about the financial side of programming: we write about how a young developer can find his or her first joband talk about promising niches for Java coders. These articles have generally considered just one source of income for a Java programmer...

If you're reading this article, you are most likely familiar with the Map interface and where can appropriately be applied. If not, then come here. Today we'll talk about the features of TreeMap's implementation, and more specifically, how it differs from HashMap and how to use it correctly...

Hi! We now continue to delve into an extensive and super important useful topic: design patterns.Today let's talk about the bridge pattern. Like other patterns, the bridge pattern serves to solve typical problems that a developer encounters when designing software architecture. Today let's study the features of this pattern...

Hi! Today we will continue to study design patterns and we'll discuss the abstract factory pattern. Here's what we'll cover in the lesson: we'll discuss what an abstract factory is and what problem this pattern solves; we'll create the skeleton of a cross-platform application for ordering coffee through a user interface...

Hi! Let's continue our study of generics. You've already gained a substantial body of knowledge about them from previous lessons (about using varargs when working with generics and about type erasure), but there is an important topic that we have not yet considered — wildcards...

Hi! Today we'll talk about something that is super important for any programmer: data structures. Wikipedia says: "A data structure is a data organization, management, and storage format that enables efficient access and modification. More precisely, a data structure is a collection of data values, the relationships...

Hi! We continue our series of lessons on generics. We previously got a general idea of what they are and why they are needed. Today we'll learn more about some of the features of generics and about working with them. Let's go! In the last lesson, we talked about the difference between generic types and raw...

Hi! In today's lesson, we'll continue to study generics. As it happens, this is a big topic, but there's no avoiding it — it's an extremely important part of the language :) When you study the Oracle documentation on generics or read online tutorials, you will come across the terms non-reifiable types and reifiable types...