How do I implement automatic import package and import package optimization settings? (suitable for various languages) (detailed text)

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Objective

Why do I need to import packages automatically? Why do I need to import package optimization?

For:

How to implement an auto-import package in idea

1. Auto Import, Editor, File, Settings

The following are the default

Set as follows: (Below is idea 2015, version 2016)

Here's the idea 2017 version

　　

Will

Add unambiguous imports on the fly

Optimize Imports on the fly

The purpose of the check is to:

Turn on automatic import package, automatically help us to import the required package, and optimize the imported package, such as automatically remove some unused packages.

Note: This is in addition to the automatic introduction of the package, of course, the premise is that this package does not have the same name, if the same name, you have to manually choose which to introduce it?

How to implement the settings for importing package optimizations (I'll take Java for example)

Of course, everyone else's settings like Scala are the same, very simple.

Optimization Introduction, if you introduce a package of many files, it will give you the optimization of the XXX package name. *. This is the configuration of the diagram below.

1. Java, Code Style, Editor, File, Settings

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How do I implement automatic import package and import package optimization settings? (suitable for various languages) (detailed text)