Step 2 - Install Java

For the standalone version you will only need the Java Runtime Environment (JRE) not Java Development Kit (JDK)
Java 8 isn’t just recommended… it’s required for most releases in the 2.x series.
To download the application use the this link https://www.oracle.com/in/java/technologies/javase/javase8-archive-downloads.html
Accept the license agreement and make sure you download the correct file basing on your operating system, whether its x32 or x64 bit.

Note: If you are unsure about the version please follow this guide http://update.se.wtb.tue.nl/documentation/install/manual-java.html

It is recommended to download the executable file (.exe) for a simpler run
Execute the downloaded file, accept the license agreement and follow the instructions in the wizard, installing in default installation directories.

Ubuntu

You can install the OpenJDK on it's own as a package

sudo apt-get install openjdk-8-jdk

or automatically as a dependency of Tomcat

sudo apt-get install tomcat7