To check which version of Java you're running, you'll need to use Windows 10's Command Prompt app. The Command Prompt can seem intimidating at first, but if you know what to type, you'll be fine ...

If you want to switch to Java 18, locate and type the associated number for Java 18 and hit Enter on your keyboard. The system will set Java 18 as the current version.

How to check the Java version on your Mac using System Preferences. 1. ... After clicking on "Java," it will let you know that the Java Control Panel opens in a separate window. 5.