Editing

Duplicate the current line or a selected block

Quickly spot which parts of your file have changed since the last commit.

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 view supertypes and subtypes in the hierarchy

IntelliJ IDEA can add the stream() call for us

IntelliJ IDEA has lots of different ways for you to view your code depending on your requirements

IntelliJ IDEA will show you related usages errors in your editor

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

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

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.

Available in preview from Java 17

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.

Minimise everything except the editor in IntelliJ IDEA

Use VCS options in IntelliJ IDEA to resolve merge conflicts visually in the editor

Join lines of code together

You can paste a PNG image from the clipboard directly into a markdown file

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

Get type aware completion in your code

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

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

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.

Use IntelliJ IDEA to check if your JSON Path expression are correct.

Use quick intentions to convert a record to a class

Use inspections to convert classes to Java 16 records

Use quick intentions to generate code automatically

Use quick intentions to add names to call arguments

Use quick intentions to adjust your code

Scratch files persist across all versions of IntelliJ IDEA

Create an editor fold to hide parts of your class

Using soft-wraps makes some languages easier to display

Selecting code by scope

Find next word and highlight all instances

Use code and statement completion to write code faster

Move a line throughout your class

Move a statement around within your method

Quickly add new classes to your project

Use quick intentions to improve the readability of your code

Use quick intentions to remove explicit types

Run just a file or a script

Add virtual whitespace to the bottom of a file

Surround code with brackets and quotes