!free! — Java Compiler Download

This is what you need. It includes the JRE plus development tools like javac (the Java compiler), javadoc , and jdb (the debugger).

This is only for running Java applications. It does not include a compiler. java compiler download

Developers who want official support and the "standard" version. This is what you need

OpenJDK is the free, open-source implementation of the Java SE platform. C:\Program Files\Java\jdk-21\bin ).

Under System Variables, find Path and add the path to your JDK bin folder (e.g., C:\Program Files\Java\jdk-21\bin ).