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Install Java on Ubuntu 16.04

1. Install the OpenJDK 8 from a PPA repository

   $ sudo add-apt-repository ppa:openjdk-r/ppa
   

2. Update the system package cache and install

   $ sudo apt-get update
   $ sudo apt-get install openjdk-8-jdk
   

3. If you have more than one Java version installed on your system use the following command to switch versions

   $ sudo update-alternatives --config java 
   

4. Make sure your system is using the correct JDK

   $ java -version
   

Reference

https://docs.datastax.com/en/cassandra/3.0/cassandra/install/installOpenJdkDeb.html