Java programming language learning from scratch. A selection of books for Java programmers with various experiences

• 2 months of Java EE training (2 times a week for 4 hours)
• if you show good results (you successfully defend your project, which you have been writing for these two months), then you are offered a job.

1. Doing practical tasks at home.
2. If successful, you are invited to computer testing in the office.
3. If the test is successful, you will be interviewed on the same day.

• what is the difference between checked exceptions and unchecked;
• what methods does the Object class have and why are they needed;
• what kinds of collections are there and why are they;
• and a little about multithreading.

We are accustomed to quick access to information and equally rapid absorption. We prefer five-minute videos to deep lectures and short articles to books. I will not claim that a good book on programming will replace any article, this is not so. And it certainly won’t replace practice. However, for me personally, a real understanding of the basics of programming came after I, having solved hundreds of problems in a programming course and read a ton of articles, began to simultaneously study the theory from books and delved into them well. I have been searching for my personal “best Java tutorial for beginners” for quite some time. Below are several books that were useful to me to a greater or lesser extent at different stages of my studies. "For the little ones" You can start reading the next two books at the start of your studies, in parallel with the video, or, if you study with JavaRush, along with the first levels. They, especially the first one, are suitable for people with zero programming background.

Head First Java

• The best Java tutorial from scratch, for complete dummies, written in living language;
• Cool illustrations and humor;
• Explanations with real-life examples.

• A lot of “water” for those who have already entered into the topic;
• Not always successful puzzles and exercises.

Herbert Shildt. Java 8 Beginner's Guide

• Traditional thoughtful presentation of the basics;
• Good examples.

• There are “jumps” from “too chewy” to “quickly said”;
• A bit boring in places.

Herbert Shildt "Java 8. The Complete Guide"

• Complete guide. It seems to have all the topics a beginner, and not just a beginner, needs to know.
• Detailed explanations.

• Lots of water (but some people might like that!);
• The Russian translation is not the best.

Java. The Professional's Library, Kay S. Horstmann, Gary Cornell

• With an impressive number of pages, there is little water (unlike Schildt).
• Contains everything beginners need.
• Reveals Java 8.
• Good presentation of topics on collections and generics.
• Pairs very well with JavaRush. Get to the topic, solve problems, at some point you don’t understand something - watch Horstmann, try again.

• Some may find the book a bit dry;
• No practice;
• Russian translation with mistakes.

"Java" Programming methods". Blinov, Romanchik

The approach to tasks there is a little different from that of JavaRush, that is, on average, the tasks here are a little more complicated and each of them is something like... not a mini, but a micro-project. So I recommend JavaRush even to students, since I think the disadvantage of the practical side of the course is that all the tasks in it are already completely designed and there are too many tips. Let's say, the OOP problems from this collection helped me understand this very OOP very well, along with the books of the “timeless classics” that I write about below. The book was written as if for future “rowers”, therefore it describes Hibernate technologies for developing distributed systems, as well as the basics of HTML, XML, JavaScript. “Industrial Programming” is, if not the best Java tutorial, then a very good textbook. But you need to come to it already prepared. Let's say, after a dozen or two levels of JavaRush. Later I discovered its newer and revised edition, already under the name “Java. Programming methods."

• Excellent selection of problems and test items;
• There is an official free version (I believe that it is official, since it is not on some root tracker, but on the EPAM website);
• Comparison with C++.
• Opportunity to understand what goes into an EPAM internship.

• Too fundamental presentation. But for repetition with practice it will be suitable.
• No Java 8.

Effective Java, Joshua Bloch

• A brilliant presentation of material on the topic of OOP.
• Best programming practices are provided.
• The author knows Java very well from the inside.

• There is currently no translation of the newest edition of the book (the third).

Java Philosophy, Bruce Eckel

• An in-depth presentation of Java principles from a professional;
• It will be good for those who are switching from other languages ​​- there are many comparisons with C++, for example.
• It seems to me that you can start reading it at level 10, but Eckel - a little later.

• Very unsuccessful Russian translations;
• Lack of a new edition of the book in Russian.

Brief conclusions

1. The best Java tutorial from scratch for those who know nothing at all - Head First Java;
2. The best Java reference-textbook and reference book is “Professional's Library”. And, of course, Oracle documentation.
3. The best collection of Java programming tasks - JavaRush. Well, among the books - “Java. Programming methods".
4. The best timeless classics are “The Philosophy of Java” and “Effective Java”. This is a must read for everyone who decided to understand everything for real, for a deep understanding. But it is better to read them gradually and in order.
5. Additional conclusion: there is an opportunity - read in English. Russian translations are generally very weak.

Russian-language channels that will help you learn Java

1. Education online

I think everyone has come across lessons from this author at least once. It may seem that he explains too slowly, but in fact it is precisely this pace that allows you to well assimilate and consolidate the information received. Works with Eclipse, which is suitable for those who are not familiar with shortcuts, libraries and other advantages of this IDE (especially since knowledge of Eclipse is required everywhere). The playlists are divided into introduction, Java for professionals, sorting algorithms, JSP, Swing, patterns and more.

2. ZhirniToni

Also a popular channel that is focused on learning the basics. In addition to the programming itself, it also presents a schematic visualization of the process, right down to an analysis of the basics of OOP. Here is an overview of the main class, console output, and loops. In general, everything you need to learn Java from scratch. The videos are short, up to 20 minutes each. The explanations, although laconic, are succinct, so that after viewing there are no unnecessary questions left. Playlists include materials "for dummies", Java Production and methodology. If you are preparing for an interview, this is what you need.

3. loftblog

Hodgepodge. No, really: this channel contains a lot of things. You can find lessons on the basics of programming, HTML, CSS, Python, Git. Even video editing in Adobe Premiere. That is, the guys have enormous experience. But we'll talk about Java. Here we are shown working with everyone (well, certainly many) beloved IntelliJ IDEA. They even show you how to install the IDE, which is useful if you're a beginner or have simply never worked with IntelliJ. At the same time, the lessons vary in duration, which depends on the complexity of the topic. The presentation of the material is easy but thorough.

4. Evil Nerd

It’s very good that the lessons here are divided into levels: there is Java training for beginners, intermediate level, JavaFX and “Writing programs in Java.” But no, you will have to write programs not only there: explanations with visualized coding are everywhere. It’s just that the last section is more detailed, designed to prepare a program from scratch. An indispensable assistant channel for beginners, whose playlists you want to peek at, even if you already have some experience.

English-language Youtube channels

5. Derek Banas

The author is not limited to Java, although learning Java with this channel will not be difficult. A lot of supporting materials are collected here. For example, if after Java you want to “transition” to Android, there is no question, because the channel has corresponding video tutorials. Both algorithms and Java tutorials are presented. The videos are equipped with presentations that succinctly and as clearly as possible explain the operation of both the language itself and the program written on it. The author also uses Eclipse.

6. Durga Software Solutions

And only now we have entered the channel with lectures. Yes, sometimes you just need lecture material - with a board, a marker, so that everything is black and white. Many people actually learn information better this way. The lecturer understands the topic and it shows in his confident explanations. A very good presentation of the material and really a lot of lectures, after watching which you can not only learn Java, but also thoroughly prepare for the future. Each lesson will take about an hour of your time.

7. Java Brains

The Java Brains teacher is an excellent teacher and technical expert in what he teaches. He has been working as a software developer for a long time, so you know that you are guaranteed to get the right content in every sense. Sometimes the author shows one of the methods, and then explains how you can change the code to do the same thing, but better, cleaner. There are many playlists, including Java Enterprise Edition, as well as analysis of such popular frameworks as Spring and Hibernate.

8. Deege U

On this channel they will tell you what it is, how to create a repository on Github, demonstrate microservices, tutorials, etc. In general, nothing new, but this channel will be an excellent addition to the previous ones, since some really interesting topics are touched on that are not covered everywhere. For example, Java EE application server Wildfly. A good lifesaver, both for beginner Javaists and for more experienced developers.

Take our selection for a pencil. It will definitely be useful for beginners who want to learn Java, and for experienced programmers who want to remember the “material parts”. Good luck in opening new horizons!

Java for dummies. Lesson 1. Hello World!

First, I'll tell you what Java can do. Firstly, in this language you can write applets - programs that are embedded in the website’s web page. For example, it could be a game, a business graphics system, and much more. Secondly, you can write full-fledged applications in Java that are not necessarily related to the Web. Or you can use servlets - programs that, unlike applets, are executed not on the client side, but on the server side.

Let's start with the very basics. Let's pay tribute to tradition and write a simple program that displays a greeting on the screen Hello World. If you don't have Java, then it can be downloaded from the official website http://www.java.com/ru. Then install it.

If Java you have installed, then type the following text in some editor:

And be sure to save it under the name HelloWorld. java- The name of the executable class must match the file name. To compile, use the program javac.exe included in the standard package Java. This is what a compilation batch file might look like this java file:

If no errors occurred during compilation:

then, most likely, the compilation was successful in yours in the same directory where HellowWorld was located. java HellowWorld has also appeared.class:

Now let's run another batch file that will call the Java interpreter along with our compiled file:

If everything is done correctly, you should get this result:

If you received it, then I can congratulate you - you have written your first program in Java. In the future we will learn how to write Java applets, and much more. And now a few words about the program itself. As you noticed, it starts with the word public. This is a modifier that means that we are declaring something publicly available: a class, a class method, or a variable. There are other modifiers, for example: private, protected, friendly, final, abstract, static. Some of them can be combined with each other. For example, private means that the variable we want to declare is private to other classes. But we'll get to the modifier later. Now let's look at the next keyword, class. It means that we are declaring a class. In java everything is based on classes. One of the classes is necessarily the base one. And the base class must be public. In this example, it is the HelloWord class. For now he is the only one we have.

Now I’ll try to explain in simple words what it is Class and what is object.

Let's remember the school zoology course. How is the living world classified? First, the concept of “kingdom” is introduced.

1. Kingdom of unicellular organisms,

2. plant kingdom

3. Animal kingdom.

Let's take animals. They can be divided by type. For example:

1. Type coelenterates.

2. Type of flatworms.

3. Type of shellfish.

4. Phylum chordata.

The latter are divided into mammals, reptiles, amphibians, birds, etc. You can go even further into the classification, but we won’t do that now, but will move directly to programming.

In the Java language, you can, similar to the classification of the living world, classify objects (pieces of program and data). It has classes for this.

Stop stop! - you say, - why classify these objects?

Imagine that you, like some demiurge (creator, god), are creating life on Earth. First you developed the simplest organic compounds. So, for the sake of experiment, what will happen. Then they combined them into complex molecules, from which, like bricks, they assembled the simplest microorganisms. But your ultimate goal is the creation of intelligent life. Therefore, you did not stop there, but created multicellular organisms. Then they began to improve them and develop them. Some species turned out to be viable, some became extinct (dinosaurs). And finally the goal was achieved - Homo Sapiens - Homo sapiens - appeared.

Now let’s come down to earth and imagine programming as a creation, where you force your program to evolve to a certain state when it can be used, and then further, gradually increasing and improving functionality.

Now let’s imagine that an atom is the simplest program command or a unit of information (which, you see, are inseparable from each other, because the program works with something – that’s right, with information).

Then the molecule is a subroutine. Or an object.

So we created a bunch of objects in our program. We need to classify them somehow so as not to get confused. This is what Java provides classes for. Using them, we describe a class of objects (a general concept, for example birds), and then, having the described class, we can create an object - an instance of this class. That is, the class is the word Birds itself, and the object is some specific bird, if we continue our analogy.

Further, birds come in different types. But they all have some common characteristics, inherited from the concept of “Birds”. Likewise in Java, from a class you can create another class that inherits its properties and methods (features). It's called inheritance.

Different birds have different feather colors, beak and wing shapes. Likewise for classes, when creating a new class, inherited characteristics can be changed. It's called polymorphism.

So, we figured out the basic concepts of Java. Now let's go through the program.

This is how we declare a class:

In this case, there is only one class in our program, and this is the base class, that is, the class responsible for launching the program. That is why its name must match the file name, so that the interpreter “knows” where to start executing the program.

The base class (HelloWorld) has a base method: main. We declared it as public and static. The first indicates that the method is public. If this were not so, then our program simply would not start. There are also methods that are not publicly available, but we will talk about them in the next lessons. For now, just remember that the base method (which is launched when we start the program) must be public. And its name should be main so that the interpreter knows where to start executing the program.

Now what is static. This is a modifier that indicates that the method is static. That is, it works even when an instance of the class (object) is not created. In general, fields and methods with the static modifier are common to all objects of the class. We'll also talk about this later.

Each method may or may not have a return value. If it does, then it's a function. The return value type is also included in the method declaration. If not, then set it to void (as in our example).

Access to the fields and methods of an object occurs through a dot. There are also built-in objects, for example, System, which we use in our example:

in this case, we access the out field, which is also an object intended for outputting data, and call its print method, which displays text on the screen (like the PRINT command in good old BASIC).

(C) Shuravin Alexander

class HelloWorld(

Table 2

Table 3

Constants in

Symbols in

Table 3.

Table 3.