setup java in ubuntu

sudo mkdir /usr/lib/jvm
cd /usr/lib/jvm
sudo tar -xvzf ~/Downloads/jre-7u80-linux-x64.tar.gz

sudo nano /etc/environment

/usr/lib/jvm/jre1.7.0_80/bin:/usr/lib/jvm/jre1.7.0_80/db/bin:/usr/lib/jvm/jre1.7.0_80/jre/bin
J2SDKDIR="/usr/lib/jvm/jre1.7.0_80"
J2REDIR="/usr/lib/jvm/jre1.7.0_80/jre"
JAVA_HOME="/usr/lib/jvm/jre1.7.0_80"
DERBY_HOME="/usr/lib/jvm/jre1.7.0_80/db"

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jre1.7.0_80/bin/java" 0
sudo update-alternatives --set java /usr/lib/jvm/jre1.7.0_80/bin/java

update-alternatives --list java

java -version


-- This is for setting up jre1.7.0_80 in Ubuntu 16.04 (guides from vultr docs)