In Eclipse, you press CTRL + SHIFT + O “Organize Imports” to import packages automatically. For IntelliJ IDEA, if you press CTRL + ALT + O “Optimize Imports”, it just removes some unused imports, never imports any package. And the worst is you need click on the class name and press ALT + ENTER keys to import the package one by one.
Solution
The IDEA is working a bit differently, the “unambiguous imports” are imported on the fly, and you need to enable this feature manually.
File –>> Settings –>> Editor –>> General –>> Auto Import –>> Checked these options :
Add unambiguous imports on the fly
Optimize imports on the fly
Note
For ambiguous imports (same class name in a different package), you still need click on the class name and press ALT + ENTER keys to import the package manually.