The official versions of Java and NetBeans we will be using for this course are Java 21 and NetBeans 20.
If you have not already done so, you should go to jdk.java.net/21/ to download the archive containing OpenJDK version 21.
On Windows you should extract the contents of this archive and move the folder containing the JDK files to the C:\Program Files\Java directory.
On a Mac you should extract the contents of this archive and move the folder containing the JDK files to the /Library/Java/JavaVirtualMachines/ folder on your Mac.
Next, go to netbeans.apache.org/front/main/download/ to download the installer for the latest version of NetBeans (version 20).
By the end of the week we will start writing GUI applications with JavaFX. For that portion of the course you will need to download and install the Scene Builder application from gluonhq.com/products/scene-builder/.