IntelliJ IDEA

IntelliJ IDEA is one of the most popular IDE among java developers. Ultimate and Community both editions are available for IntelliJ IDEA. In this article developers will find some useful plugins to boost their development experience as well as most used keymaps to keep their hands mostly on the keyboard.

Useful IntelliJ IDEA Plugins

To generate boilerplate code (e.g. Getter, Setter and so on) during compile time Lombok plugin is the best choice for the developers. It is very easy to use due to its annotation based code generation.
AsciiDoc plugin brings Asciidoc supports for the developer. It helps to write the technical documentation easily on the same IDE they have used for the development.
Extra Icons plugin helps to visually recognize different file formats almost instantly by their icons.
If you are struggling to find opening and closing brackets in your code, Rainbow Brackets plugin may help you. It helps developers to find brackets through rainbow coloring.
CodeGlance plugin is a code mini map. It helps to navigate fast across the editor window.

Keymaps

Keymap learning and presentation plugins for IntelliJ IDEA

Key Promoter X plugin shows a popup notification with the corresponding keyboard shortcut whenever a command executed using the mouse. It also shows most used keymap statistics.
Presentation Assistant plugin shows a popup with the corresponding description whenever a keymap pressed. It can be very useful during presentation, screencast.

Both plugin can be used together for learning shortcuts.

Download the default keymap reference card by Jetbrains. This keymap card is also available inside your IDE under Help Keymap Reference.

Most Used Keymaps

Most used keymaps for productive development.

Windows & Linux
Shortcut	Purpose
General
`Alt`+`0-9`	Open corresponding tool window
`Ctrl`+`Shift`+`A`	Find Action
`Ctrl`+`Alt`+`S`	Open Settings dialog
`Ctrl`+`Alt`+`Shift`+`S`	Open Project Structure dialog
`Ctrl`+`Shift`+`F12`	Toggle maximizing editor
Search/Replace
`Shift`+`Shift`	Search everywhere
Editing
`Alt`+`Enter`	Show intention actions and quick-fixes
`Ctrl`+`Shift`+`Enter`	Complete current statement
`Ctrl`+`Alt`+`L`	Reformat code
`Ctrl`+`W` `Ctrl`+`Shift`+`W`	Extend or shrink selection
`Ctrl`+`/` `Ctrl`+`Shift`+`/`	Add/remove line or block comment
`Ctrl`+`P`	Parameter info (within method call arguments)
`Ctrl`+`Shift`+`Space`	Smart code completion
`Ctrl`+`Shift`+`Space`	Smart code completion
Navigation
`F2` `Shift`+`F2`	Navigate between code issues
`Ctrl`+`E`	View recent files
`Ctrl`+`B`	Go to declaration
`Ctrl`+`N`	Go to class
`Ctrl`+`G`	Go to line
`Ctrl`+`Shift`+`I`	Open quick definition lookup
Usage Search
`Alt`+`F7`	Find usages
Live Templates
`Ctrl`+`Alt`+`J`	Surround with Live Template
`Ctrl`+`J`	Insert Live Template
Refactoring
`Ctrl`+`Shift`+`Alt`+`T`	Invoke refactoring
Debugging
`F8`	Step over
`F7`	Step into
`Alt`+`F8`	Evaluate expression
`Ctrl`+`F8`	Toggle breakpoint
Compile and Run
`Ctrl`+`F9`	Make project
`Shift`+`F10`	Run
`Shift`+`F9`	Debug
VCS/Local History
`Ctrl`+`K`	Commit project to VCS
`Ctrl`+`Shift`+`K`	Push commits

Shift+Shift: Press double shift to search everywhere. Type / IntelliJ IDEA will list the available groups of settings. Select the one you need and press Enter or type the settings name by prepending with # and press Enter Details

Tool Windows Keymap

Windows &
Shortcut	Tool Window
`Alt`+`1`	Project
`Alt`+`2`	Favourite
`Alt`+`3`	Find
`Alt`+`4`	Run
`Alt`+`5`	Debug
`Alt`+`6`	TODO
`Alt`+`7`	Structure
`Alt`+`8`	Services
`Alt`+`9`	Git
`Alt`+`F12`	Terminal
`F12`	Jump to Last Tool Window
`Ctrl`+`Shift`+`F12`	Hide All Tool Windows

Live Templates

To see live templates in action, type live template shortcut (e.g psvm) in your editor window and hit Tab.

Detail list of live templates are available under Settings Editor Live Templates.

Declaration

main() method declaration

psvm / main

    public static void main(String[] args) {
            //code
    }

Statement

Prints a string to System.out

sout

        System.out.println(myVariable);

Inserts 'if null' expression

ifn

        if (myVariable == null) {
            // code
        }

Inserts 'if not null' expression

inn

        if (myVariable != null) {
            //code
        }

Create iteration loop

fori

        for (int i = 0; i < myVariable; i++) {
            //code
        }

Iteration according to Java SDK 1.5 style

iter

        for (String arg : args) {

        }

Check object type with instanceof and downcast it

inst

        if (args instanceof Object) {
            Object o = (Object) args;
                //
        }

Iterate elements of java.util.Collection

itco

        for (Iterator iterator = collection.iterator(); iterator.hasNext(); ) {
            Object next =  iterator.next();

        }

Iterate elements of java.util.Iterator

itit

        while (iterator.hasNext()) {
            Object next =  iterator.next();

        }

Iterate elements of java.util.List

itli

        for (int i = 0; i < list.size(); i++) {
            Object  (A) list.get(i);
            //
         }

Additional Resources

Watch

Pluralsight - Getting Started with IntelliJ CE by David Starr.
- Duration 2h 47m.
- Released 1 Sep 2017.