IntelliJ IDEA Quick Guide

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IntelliJ IDEA macOS Shortcut List

Shortcut Description
Command + Option + L Reformat code. Neatly aligns source-code indentation and tabs.
Command + delete Deletes the line containing the cursor.
Command + D Duplicates the line containing the cursor.
Command + B Navigates to the source referenced at the cursor.
Command + Option + B When the cursor is on a Java interface method, navigates to its implementation. You can also use “Right-click > Go to > Implementation”.
Control + Option + O Removes unused imports.
Command + Shift + U Changes letter case.
Command + Shift + 8 Toggles multiple cursors. This is useful when editing several lines at once.

Viewing Korean Text in IntelliJ IDEA properties Files

In Eclipse, you had to install a separate Properties plugin to view multilingual text in properties files. In IntelliJ IDEA, you can view multilingual text with a simple setting.

  • Go to [Preferences]-[Editor]-[File Encodings].
  • Select Transparent native-to-ascii conversion.
  • Click Apply.

Automatically Adding Java Imports in IntelliJ IDEA

To configure IntelliJ IDEA to add imports automatically:

  • Go to [Preferences]-[Editor]-[General]-[Auto import].
  • Select Add unambiguous imports on the fly.
  • Click Apply.

Automatically Removing Unused Java Imports in IntelliJ IDEA

To configure IntelliJ IDEA to remove unused Java imports automatically:

  • Go to [Preferences]-[Editor]-[General]-[Auto import].
  • Select Optimize imports on the fly.
  • Click Apply.

When Compilation Errors Do Not Disappear in IntelliJ IDEA

Sometimes a compilation error occurs because IntelliJ IDEA cannot import or find another class.

  • Click [File]-[Invalidate Caches].
  • Click Invalidate and Restart.

Configuring the Project Java Version in IntelliJ IDEA

JDK settings:

  • Click [File]-[Project Structure]-[Project].
  • Set the Java version in Project SDK.

Gradle JRE settings:

  • Click [Preferences]-[Build, Execution, Deployment]-[Build Tools]-[Gradle].
  • Set the Java version as the JRE under “Build and run”.

DataGrip Shortcuts

Shortcut Description
Command + Shift + U Converts text to uppercase.
Command + Option + L Neatly aligns SQL-code indentation and tabs.