ubuntu 20.04 java code example

Example 1: how to install java 8 on ubuntu 20.04

sudo apt update
sudo apt install openjdk-11-jdk

sudo apt update
sudo apt install openjdk-8-jdk

Example 2: install java on ubuntu 20.04

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EA8CACC073C3DB2A