There is an easy way to install Java 8 using packages. One way to do this is using a shell script.
The script is leightweight and does the installation und update for you, nice and easy.
Create the Sheel script yourself with the code below our download it via https://secure.aebian.org/java-installation
I hope this helped you to install Java 8 on your debian machine.
You can check afterwards your java-version with "java -version" Your output should look like this:
If it does then you're all set and ready for your Java applications or games ;)
For any questions and problems regarding this post use the comment section below.