Java

Extract code to a variable

My favourite tips for all new starters in IntelliJ IDEA

Navigate to any of the files that you recently had open

How to build a terminal-based text editor with Java

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

IntelliJ IDEA highlights terminal commands you can run in IntelliJ IDEA

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

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

You can restore previously configured breakpoints if you accidentally delete them

You can view supertypes and subtypes in the hierarchy

IntelliJ IDEA can spell check and fix errors for you

Experiment with your code without changing the semantics

IntelliJ IDEA can add the stream() call for us

IntelliJ IDEA will show you related usages errors in your editor

Using interactive rebase in IntelliJ IDEA

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

View the definitions of database entities quickly in the Database Tool Window

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

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

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

Type Info is very helpful on a per-expression basis

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

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

IntelliJ IDEA Ultimate allows you to generate UML diagrams.

Available in preview from Java 17

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

Visualize the flow of data through a stream

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

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

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

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

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

How you can rearrange code in your classes and projects

Why and how you can reformat code in your projects

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

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

Understand how IntelliJ IDEA integrates with Maven.

Migrating your JUnit 4 test suite to JUnit 5

Tips for getting started with IntelliJ IDEA

Move forward and backward between your locations in the code

Commit your changes to VCS

Inline a variable in your code

Join lines of code together

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

Use CamelCase to find what you need faster

Get type aware completion in your code

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

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

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

Generate a new test class from your Java class

Generate a test method in your Test class

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

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

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

Context Actions are available from most places in the code.

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

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.

Understand how IntelliJ IDEA integrates with Gradle.

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

Set a Run Target to change where your code runs

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

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

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

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

Data flow analysis is always being improved to show us potential errors in our logic.

Inspections can show us new features from Java 16

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

Get up to speed on Java 16 with our top tips.

Use quick intentions to convert a record to a class

Use inspections to convert classes to Java 16 records

Create a new Java record class

IntelliJ IDEA will warn you if you're using deprecated methods, and they will be shown with a strikethrough if they're marked for removal

Inspections can guide us to use new Java features

Learning new things in the IDE

Easily add breakpoints from the run window

You can refactor a method to change its signature

Use quick intentions to manage imports

Refactor the signature of a method

Use quick intentions to remove redundant code

Scratch files persist across all versions of IntelliJ IDEA

Download or associate a JDK with your project.

You can move editor tabs around as required

Editor breadcrumbs show you your file structure

Create an editor fold to hide parts of your class

Git Staging is an alternative approach to IntelliJ IDEA Changelists

Code completion may be enhanced with ML

Helps to reduce options that are not relevant for your code

Selecting code by scope

Extract a value to a constant

Extract code to a field

Extract code to a new method

Extract code to a parameter

Extract code to a variable

Use Find Actions to modify your IntelliJ IDEA interface.

Find next word and highlight all instances

Use Find Usages to search for references in your code base

Helps you to generate commonly used code constructs

Use quick intentions to adjust your code

Hide all the windows to increase your workspace

Minimise your interface to allow you to focus on your code

Inline a method

Use quick intentions to remove redundant code

Move a line throughout your class

Move a statement around within your method

Go to one or more implementations across your code base

Go to your matching test class

Quickly add new classes to your project

Navigate to any of the files that you recently had open

Quickly navigate around your recent locations in your code base

Renaming in IntelliJ IDEA including comments and texts

Use quick intentions to replace a local variable type with `var`

Run just a file or a script

Use Search Everywhere to search everything in IntelliJ IDEA

Perform basic calculations with Search Everywhere

View your git commits in the Search Everywhere dialog

Add virtual whitespace to the bottom of a file

Surround code with brackets and quotes

Toggle Tool Windows to tailor your interface

Setup the editor to suit your requirements

Use quick intentions to remove redundant code

Get a project from source control, open an existing project, or create a new project

Writing JUnit 5 Tests