install JRE/JDK on ubuntu 16.06

For Mac system Download ‘dmg’ file from here and double click on it.

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

For Linux: 

Don’t install OpenJDK

 $ sudo apt update && sudo apt install openjdk-9-jre-headless
 $ java -version
 openjdk version "9-internal"
 OpenJDK Runtime Environment (build 9-internal+0-2016-04-14-195246.buildd.src)
 OpenJDK 64-Bit Server VM (build 9-internal+0-2016-04-14-195246.buildd.src, mixed mode) 

Install Oracle Java:

 $ sudo add-apt-repository ppa:webupd8team/java
 $ sudo apt-get update
 $ sudo apt-get install oracle-java8-installer
 $ java -version
 java version "1.8.0_171"
 Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
 Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode) 

After installing Java on Linux system, You must have to set JAVA_HOME and JRE_HOME environment variables. Which is used by many Java applications to find Java libraries during runtime. You can set these variables in /etc/environment file using the following command.

 cat >> /etc/environment <<EOL
 JAVA_HOME=/usr/lib/jvm/java-8-oracle
 JRE_HOME=/usr/lib/jvm/java-8-oracle/jre
 EOL