How to optimize imports automatically after each save in IntelliJ IDEA

Question

I want to learn how can I automatically optimize imports after each save as we do Eclipse(save actions).

Answer 1

The mentioned answer works, but there is also the Intellij "save actions" plugin available from the JetBrains plugin repository that does that (as well as other things): Intellij Save Actions Plugin.

Installation

File > Settings > Plugins > Browse repositories... > Search 'Save Actions' > Category 'Code tools'

Disclaimer

I'm the plugin developer