Java - JetBrains Guide

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Commit Changes

Commit your changes to VCS

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Disable Usages

Disable the inlay hint for Usages

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AI Assistant Chat

Chat with AI Assistant inside the IDE

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Find in File

Find a specific name or string in your file

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Generate unit tests

Generate unit tests with AI Assistant

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Toggle Rendered View

Toggle Rendered View for one or all Javadoc comments

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AI Actions

Use AI Actions in the editor

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Close tabs

Close inactive tabs

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Expand and Collapse Code

Quickly view specific parts of a class by expanding or collapsing code

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Move Statement

Move a statement up or down

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Explain Runtime Error with AI Assistant

Let AI Assistant explain runtime errors to you

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Interactive rebase

Using interactive rebase in IntelliJ IDEA

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Write documentation with AI Assistant

Generate documentation for your code with AI Assistant

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Dependency Matrix

Explore project structure with the Dependency Matrix

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Import multiple repositories

Import multiple related repositories into one IntelliJ IDEA project

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Optimize imports

Remove unused imports from your code

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Rename bookmark

Rename an existing bookmark

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CamelCase in code completion

Use CamelCase in code completion

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Extract Method

Extract code to a new method

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Generate a Test Class

Generate a new test class from your Java class

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Inline Variable

Inline a variable in your code

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Introduce variable

Refactor your code and introduce a new variable

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Postfix Completion

Postfix completion allows you to keep typing forwards, it minimises the amount of time you spend moving the cursor around while you're coding.

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Surround with

Surround your code with common programming constructs

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Live Templates

Use Live Templates to auto-complete common code structures for you

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Debugging

Use the debugger to help you understand what your code is doing.

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Debugging Streams

Visualize the flow of data through a stream

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Recent Files & Locations

Quickly navigate around your recent files & locations

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Clipboard history

Paste a subset or multiple entries from your recent history

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Data flow analysis

Data flow analysis can show us potential errors in our logic

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Extend Selection

Extend and shrink selection

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Go to Next Error

Quickly move to the next (or previous) error or warning in the file.

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Find in Files

Find a specific string in (a subset of files in) your code

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Inlay hints

Inlay hints provide additional information about your code

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Structural Search

Structural Search and Replace

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Context Actions

Use Alt+Enter to show available context actions

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Generate Code

Helps you to generate commonly used code constructs

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Navigate to Test

Go to your matching test class

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Navigating Forward & Backward

Move forward and backward between your locations in the code

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Explore project structure with the Dependency Matrix

Exploring project structure with the Dependency Matrix in IntelliJ IDEA

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Interpret the Dependency Matrix

How to interpret the Dependency Matrix

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Summary and Shortcuts

Explore project structure with the Dependency Matrix Summary

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Opening the Dependency Matrix

Opening the Dependency Matrix for your project

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Introduction

Explore project structure with the Dependency Matrix

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Extract Variable

Extract code to a variable

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Getting started with IntelliJ IDEA

My favourite tips for all new starters in IntelliJ IDEA

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Marco Codes - Building a Text Editor

How to build a terminal-based text editor with Java

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Presenting with IntelliJ IDEA

Tips & tricks to level up your presentation skills with IntelliJ IDEA.

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Highlighted commands in the terminal

IntelliJ IDEA highlights terminal commands you can run in IntelliJ IDEA

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Inspections Widget

The top-right corner of your editor shows you information about the state of your class

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Restore a Deleted Breakpoint

You can restore previously configured breakpoints if you accidentally delete them

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View supertype and subtype hierarchy

You can view supertypes and subtypes in the hierarchy

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Built in Spell Checking

IntelliJ IDEA can spell check and fix errors for you

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Merge/Unmerge If Statements

Experiment with your code without changing the semantics

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Code Completion for the Stream API

IntelliJ IDEA can add the stream() call for us

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Navigating a Long Class

There are various tips and tricks you can use to navigate a long class in IntelliJ IDEA

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Find & Select Multiple Occurrences

Select multiple occurrences of the same word and change them all at once

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Navigate to the last edited location

Move around the files you're working on quickly with keyboard shortcuts

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Add Favourite Photo as Background

If you want to look at your favourite photo while coding you can set it as your background image

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Determining the return type of expression

Type Info is very helpful on a per-expression basis

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Edit a document in IntelliJ IDEA LightEdit Mode

Use IntelliJ IDEA’s text editing features without creating or opening a dedicated project.

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Generate a UML diagram

IntelliJ IDEA Ultimate allows you to generate UML diagrams.

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Inject a language

Language injections let you work with pieces of code in other languages embedded in your code.

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Pattern Matching for Switch

Available in preview from Java 17

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Java 17

Get up to speed on Java 17 with our top tips.

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Move Line

Start a new line below or above your current line with the correct indentation.

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In editor doc rendering

You can render Javadocs directly in the editor including HTML tags, images and links.

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Writing Less Code With Live Templates

How you can use live templates to get IntelliJ IDEA to write more code for you

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Migrating from the `javax` to `jakarta` namespace

How to transition your application from Java EE to Jakarta EE.

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IntelliJ IDEA 2021.1

Tips to get you productive with the new or improved features in IntelliJ IDEA 2021.1

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Rearranging Code in IntelliJ IDEA

How you can rearrange code in your classes and projects

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Reformatting Code in IntelliJ IDEA

Why and how you can reformat code in your projects

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Using the Terminal in IntelliJ IDEA

IntelliJ IDEA has a built-in terminal that you can use to perform a number of functions inside your IDE

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Hello World in IntelliJ IDEA

Create a new Java application and JAR file that prints `Hello World` to the console.

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Working with Maven

Understand how IntelliJ IDEA integrates with Maven.

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Migrating JUnit 4 to JUnit 5

Migrating your JUnit 4 test suite to JUnit 5

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Getting Started with IntelliJ IDEA

Tips for getting started with IntelliJ IDEA

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Join Lines

Join lines of code together

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Paste a clipboard image onto the Project Window

If you have an image on your clipboard you can paste it straight into the Project Window

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CamelCase in Searching

Use CamelCase to find what you need faster

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Smart Completion

Get type aware completion in your code

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Getting Started with Spring Data JPA

Learn how to use Spring Data JPA to store and retrieve data from your database.

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Generate constructors and accessor methods

We can quickly generate common code constructs such as Constructors and Get and Set methods

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Generate Overrides for equals(), hashCode() and toString()

We can generate the code to override the equals and hashCode methods

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Generate Test Methods

Generate a test method in your Test class

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Type into any dialog to search

You can start typing into a dialog box to search, even if there's not a textual search box available.

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Your First Spring Boot Application

In this tutorial we will use IntelliJ IDEA to create your first "Hello World" Spring Boot application. We'll also discuss what's in your project and why. Spring Boot is a way to create Spring applications easily with some abstractions, some of which we'll touch on in this tutorial.

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Writing Tests with Spock

Learn about the Spock testing framework by creating a project that uses Spock to unit test Java code

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Working with Gradle

Understand how IntelliJ IDEA integrates with Gradle.

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Profile your application

See how your application is performing with the built-in profiler

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Run your code with Docker, SSH or WSL

Set a Run Target to change where your code runs

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Generate UML diagrams for your Kotlin code

JVM developers working with Kotlin code can create UML diagrams for their Kotlin classes, just like they could with Java classes

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Use a lightweight inspection profile on commit

Fully customise the checks you must perform before you commit your changes to version control

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Create a correct parent Sealed Class

Sealed types are a new idea for Java developers, let IntelliJ IDEA guide you in how to use them

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Create a correct child Sealed Class

Sealed types are a new idea for Java developers, let IntelliJ IDEA guide you in how to create child classes

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Use new methods on the Streams API

Inspections can show us new features from Java 16

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Turn on Preview Features to try new Java features

The latest versions of Java contain "Preview Features", features that are fully functional but require developer feedback. Try them out in IntelliJ IDEA.