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10 March 2020 19:38
How Java helps to run an airport and how you can help to improve life in the 21st century
If you have ever travelled by plane, there is a pretty good chance that somewhere in the background the business processes that made your journey possible were supported or enabled by some system running a program written in Java...
6 March 2020 12:42
Spring for lazy people Foundation, basic concepts, and examples with code. Part 2
I'm going to do it using IntelliJ IDEA Enterprise Edition. But all my examples should also work in the free IntelliJ IDEA Community Edition. In the screenshots, if you see that I have some window that you don't have, don't worry — it's not...
6 March 2020 10:29
Spring for lazy people Foundation, basic concepts, and examples with code. Part 1
In this article, I'm not going to tell you how to get a working Spring project up and running in 5 minutes using my code. I'm only going to write the basics — things that you could be ignorant of and still create a project. But in this article, you still...
29 February 2020 13:06
What is a QA engineer and how do you become one?
Today a lot of people dream of finding a job in IT, because of the industry's relatively high salaries, as well as the consistent demand for IT specialists in the labor market. Most often, these dreams shatter when they run up against the need for specialized education that the dreamer has neither the time nor money...
28 February 2020 13:49
For-each loop in Java
A for-each is a kind of for loop that you use when you need to process all the elements of an array or collection. That said, the phrase for-each is not actually used in this loop. Where type is the type of the iterator variable (which matches the datatype of elements in the array!), itVar is its name, and array is an array...
28 February 2020 11:47
The While Statement
Our very first programs were a sequence of instructions that are executed one after another. No forks. This includes HelloWorld, which displays a greeting. It includes arithmetic calculations. After our first programs, we learned how to branch, i.e. how to make a program perform different actions...
12 February 2020 12:44
Map Interface in Java
The Java Map interface is a part of Java Collection framework, but it is not a subtype of the Collection interface. So it behaves in a different way compared to, say, Lists, or other collection Objects. Each element of Map represents...
28 January 2020 9:45
Java Files, Path
Hi! Today we'll talk about working with files and directories. You already know how to manage file contents: we've dedicated a lot of lessons to this :) I think you find it easy to remember a few classes used for these purposes. In today's lesson, we'll talk specifically about file management: creating, renaming, etc...
21 January 2020 12:24
Java Hashtable class is one of the oldest members of Java Collection Framework. It is an implementation of mathematical hash table data structure. In Java hashtable internally contains buckets where the key/value pairs are stored. Hashtable is pretty similar to HashMap. The most significant difference between...
21 January 2020 10:36
Java serialization formats
Hi! Let's talk about serialization. You probably remember that we've already had lessons on serialization. And so we did :) If you don't remember well how serialization works, why serialization is needed, and what tools Java has for serialization, you can run through these lessons. Today's lesson will be about...
21 January 2020 8:25
BigDecimal in Java
Hi! In today's lesson, we'll talk about large numbers. No, I mean REALLY BIG. We have previously repeatedly encountered the table of value ranges for primitive data types. It looks like this...
20 January 2020 13:58
Generics in Java
Hi! We're going to talk about generics. I must say that you will learn a lot! Not only this lesson, but also the next few lessons, will be devoted to generics. So, if you're interested in generics, today's you're lucky day: you will learn a lot about the features of generics. And if not, resign yourself and relax...
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