java -version javac -version You should see output similar to:

setx JAVA_HOME "C:\Program Files\Eclipse Adoptium\jdk-21.0.2.13-hotspot" setx PATH "%JAVA_HOME%\bin;%PATH%"

Downloading the JDK is the first, simple step into the world of Java development. Pick a trusted source, stick to an LTS version, and you’ll have a solid foundation for any Java project. Last updated: 2026. Java versioning and distribution policies change slowly, but always check the official OpenJDK or Adoptium site for the latest builds.

openjdk version "21.0.2" 2024-01-16 LTS If the commands are not recognized, the JDK is not in your system PATH . Windows (Command Prompt as Admin):