Configuring Single-Class Imports in IntelliJ IDEA | Generated by AI

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IntelliJ IDEA provides settings to control how it handles imports, including preventing the use of wildcards. Here’s how you can configure it to always use single-class imports:

1. Open Settings/Preferences:
   • Windows/Linux: Ctrl + Alt + S
   • macOS: Cmd + , (Comma)
2. Navigate to Code Style for Java:
   • In the left-hand pane of the Settings dialog, navigate to: Editor -> Code Style -> Java
3. Go to the “Imports” Tab:
   • On the right side, select the Imports tab.

4. Configure Import Settings: You’ll see a few important settings here:

   • Use single class import: Check this checkbox. This is the primary setting that tells IntelliJ to prefer individual class imports over wildcard imports.

   • Class count to use import with '*': This setting determines how many classes from a single package must be imported before IntelliJ automatically switches to a wildcard import (e.g., java.util.*). To effectively disable wildcard imports, set this to a very high number, such as 999 or 9999. This ensures that you’ll almost never reach the threshold for a wildcard import.

   • Names count to use static import with '*': This is similar to the above but for static imports. Set this to a high number as well (e.g., 999 or 9999) to prevent wildcard static imports.

   • Packages to Use Imports with '*': This table lists packages for which IntelliJ will always use wildcard imports, regardless of the other settings. Ensure this table is empty if you want to completely avoid wildcard imports. If you see entries like java.util.* or java.awt.*, remove them.

5. Apply Changes:
   • Click Apply and then OK to save your changes.

After making these changes:

• When you use the “Auto Import” feature (e.g., by pressing Alt + Enter on an unresolved class), IntelliJ will now insert individual class imports instead of wildcards.
• If you have existing files with wildcard imports, you can use the “Optimize Imports” action (Ctrl + Alt + O on Windows/Linux, Cmd + Option + O on macOS) to convert them to single-class imports according to your new settings.

By following these steps, you can effectively prevent IntelliJ IDEA from using wildcard imports for Java files.

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