You need to configure the Project Structure settings within the IDE.

First, ensure IntelliJ IDEA recognizes the newly installed JDK: Open IntelliJ IDEA. Go to File > Project Structure (or press Ctrl+Alt+Shift+S on Windows/Linux). In the Project Structure dialog, under Platform Settings, select SDKs. Click the plus (+) icon and select Add JDK from disk.... Navigate to the installation directory of your JDK 25 (e.g., C:\Program Files\Java\jdk-25) and click OK. IntelliJ IDEA will add the JDK to its list of available SDKs. Click Apply and then OK.

This script automates the setup of a modern C++ development environment on Debian/Ubuntu-based systems for use with Visual Studio Code (VS Code).
It installs essential Clang tools, build utilities, and configures VS Code extensions for a clean, standardized workflow.