How can i tell what version of java i have installed? ask question and would like to know if there is a command to see the version of java that is installed and active also, which version works best? all this on 32bit ubuntu 1204 edit: ok, so it seems like i have both openjdk 6 and 7, with openjdk 7 in use java version "170_04. Java version 17 ubuntu. This article will guide you through the process of installing and managing different versions of java using apt-get