The most important thing to know is that ArchBang is Arch prepackaged with Openbox. So if you can't find your answer in our wiki or forum, then search the Arch forum, wiki, and package list. Here is the link to the Arch wiki on Java: https://wiki.archlinux.org/index.php/Java.
If you are not familiar with pacman, then read up on it here: https://wiki.archlinux.org/index.php/Pacman. For example, if you open the terminal and type
pacman -Ss jre
you get two options for installing Java runtime.
Massive thanks Mike.
I've recently found an old Pentium III Coppermine 1000 computer and for a summer project I decided to make it as fast as possible without spending a penny. I think people just don't realize that if they optimize and run lightweight programs they can really go far with very little. Naturally the first step would be to pick an operating system. Obviously Linux based, considering both the lightweight and free criteria. However which Linux distro was then the question. Ubuntu was user friendly, but far too heavy. I decided to go with Archbang because of how lightweight it is. So currently I have Archbang 32 bit installed. Next was figuring a way to benchmark it. I decided on a java program, (maybe even Minecraft?). However, I didn't realize how mind bending it can be to install JRE in AB. So there's my question. I have a brand new AB 32 bit and want to get JRE on it. I may not know much but I am more than willing to learn. You guys have an awesome userbase and I know that you guys are equally willing to help.
TL;DR: I'm a complete noob and need help going from 0 to JRE on AB 32.
edit: And I do have another computer that I use for the rest of everything so it isn't a huge deal if I can't get it working.