If you are using one that has not been imported （import） Past class , Or its static methods or static fields ,IDEA Will give corresponding suggestions , Just press ⌥（option） And return to accept the proposal .

But I think it's still troublesome , Not intelligent enough . What shall I do? ？

open IDEA Preferences for , find Editor | General | Auto Import. Check on Add unambiguous imports on the fly and Optimize imports on the fly (for current project).

Click on 「OK」 after , The import statement will be automatically imported when the code is copied .

Yes, of course , The precondition is that the import statement is single , If there are multiple options ,IDEA The corresponding suggestions will still be given for you to manually select .