How to prevent IntelliJ IDEA from deleting unused packages?

Intellij Idea

Intellij Idea Problem Overview

I'm working with intelliJ and my problem is when I start to import some temporary unused packages into my class file intellij delete those line within a second.

how can I turn off this not so nice feature?

Intellij Idea Solutions

Solution 1 - Intellij Idea

Disable File | Settings | Editor | General | Auto Import | Optimize imports on the fly.

Normally you don't need to add imports manually, IDEA does it for you.

Solution 2 - Intellij Idea

For Scala developers: you can have enabled

Settings > Editor > General > Auto Import > Optimize imports on the fly

but add exclusions into

Settings > Editor > Code Style > Scala > Imports always marked as used:

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Solution 3 - Intellij Idea

In Intellij 14 : Settings > Editor > General > Auto Import > Optimize imports on the fly.

Solution 4 - Intellij Idea

(Update) For the Scala developers out there, you can have 1/2 the cake and eat the other 1/2 now: disable the auto-optimize for just scala

enter image description here

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionSeyed Vahid HashemiView Question on Stackoverflow
Solution 1 - Intellij IdeaCrazyCoderView Answer on Stackoverflow
Solution 2 - Intellij IdeaSashaView Answer on Stackoverflow
Solution 3 - Intellij IdeamerrickView Answer on Stackoverflow
Solution 4 - Intellij IdeaDilum RanatungaView Answer on Stackoverflow