Create a simple console app in IntelliJ IDEA to learn Java

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Форум (ваши вопросы, обсуждение)

Programming, development, testing

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Java

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Learn the language Java (class, interface, properties, etc.)

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Create a simple console app in IntelliJ IDEA to learn Java

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Create a simple console app in IntelliJ IDEA to learn Java

last updated: 22 November 2025

Note! You must have Java JDK installed. If you don't have it, then need to download and install Java JDK ...

Note! You must have IntelliJ IDEA installed. If you don't have it, then need to download and install IntelliJ IDEA ...

Download an example:

MyJavaConsole1.zip ...
size: 5 kb

Step 1. Open IntelliJ IDEA

Step 2. Let's create a new project in IntelliJ IDEA

Let's choose the programming language: Java.
Select JDK: I have OpenJdk-22

A new application has been created:

Step 3. Launching the project

To start a project:
On the left, click on the Main file
At the top, click on the triangle and the application will start

After completing the program, we will see:
Hello world!

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Download and install

• Installation JDK (download and install the Java library for Windows)

• Download and install IntelliJ IDEA to explore Java, Spring, Jakarta EE | Functionality and differences: Community | Ultimate

Learn the language Java (class, interface, properties, etc.)

• Create a simple console app in IntelliJ IDEA to learn Java

• What is interface in Java ?

• Directly in the code (at runtime) we make an implementation for the interface | Java

• Threads in Java

• lambda is an unnamed method (no name and no class owned) | Java

• Exceptions and handling in Java. Example: try {...} catch (Exception e) {...}

• Why use throws Exception in the function name in Java? Answer: The method throws an exception and there is no handling of try catch. Example: float CalculateDensity(float mass, float volume) throws Exception { ... throw new Exception("Error! Volume is zero."); ... }

Java web application (servlet, jsp page, basic functionality and no frameworks)

• Creating a new simple web application (jsp web page) | Java, Maven

• Create a web servlet (the servlet is located on the web server, returns the result on request) | Java

• Installation Tomcat web server (download and install for Windows)

• Check, test Tomcat web server (create a new my.hml file)

• What is Maven

• What is a dynamic web page jsp (Java Server Page) ?

• How to install Smart Tomcat plugin in Intellij Idea

• Error "The SDK is not specified for module ... | Project SDK is not defined ..." in IntelliJ IDEA | Java

Spring in Java (Spring Framework, Spring Data, Spring Boot, ...)

• What is Spring? Why use Spring in Java?

• What is Spring Bean? What is Spring Container? IoC (inversion of control) | Creating a simple Spring project and configuration Spring Container in an XML file | Editor IntelliJ Idea and language Java

• What is Dependency Injection in Spring? Creating a simple Spring project with Dependency Injection in the constructor with the attributes @Component, @Autowired | Editor IntelliJ Idea and language Java

• Create a new Spring Web application (the request goes to the Controller → Controller creates a response as text or json) | Java, Spring Web, Spring Boot, Maven

• Creating a new Spring WebSocket application (Java WebSocket sends a message to the JavaScript WebSocket) | Java, Spring WebSocket, Spring Boot, Maven

• Create Azure Web App with the type Java (free). That is, create an empty web server

• Put the Java Spring web application in Azure

• Connect to the application Azure Web App (Java) via FTP | use File Explorer

• Error "The SDK is not specified for module ... | Project SDK is not defined ..." in IntelliJ IDEA | Java, Spring Boot

• How to install Spring WebSocket plugin in Intellij Idea

Jakarta EE / Java EE in Java (Web Applications, Web Services)

• What is Jakarta EE (Java EE)? | In which editor (program) is it convenient to write Jakarta EE (Java EE) code?

• Creating a simple web project in IntelliJ Idea Ultimate | Jakarta EE (Java EE)

Struts in Java (extends API Java Servlet using MVC)

• What is Struts | Java

• Interviews on Java

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