1-Download the installation tarball File:

Please  endure that  Wget packahe has been installed  , else yu  may Download  manually the tarball directly from the Oracle website 

cd /opt

 wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u191-b12/2787e4a523244c269598db4e85c51e0c/jdk-8u191-linux-x64.tar.gz"

2-extract the compssed file

tar xzf jdk-8u191-linux-x64.tar.gz

3- Install Java 8 with Alternatives

The alternatives command is used for maintained symbolic links. This command used to creates, removes, maintains and displays information about the symbolic links comprising the alternatives system.

cd /opt/jdk1.8.0_191/
alternatives --install /usr/bin/java java /opt/jdk1.8.0_191/bin/java 2
alternatives --config java

its  showing 1 program which provide ‘java’. because   only this last one release Command
———————————————–

At this point JAVA 8 has been successfully installed on mysystem. We  recommend to setup javac and jar commands path using alternatives

alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_191/bin/jar 2
alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_191/bin/javac 2
alternatives --set jar /opt/jdk1.8.0_191/bin/jar
alternatives --set javac /opt/jdk1.8.0_191/bin/javac

4 – Check Installed Java Version

Java and javac binaries are available under PATH environment variable. You can use them from anywhere in your system. Let’s check the installed version of Java runtime environment (JRE) on your system by executing the following command.

java -version

[root@osradar jdk1.8.0_191]# java -version
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)
[root@osradar jdk1.8.0_191]#

5 – Setup Java Environment Variables

Most of Java based application’s uses environment variables to work. Set the Java environment variables usingthe  commands

Set the PATH, JAVA_HOME, and JRE_HOME  environment variables.

export JAVA_HOME=/opt/jdk1.8.0_191
export JRE_HOME=/opt/jdk1.8.0_191/jre
export PATH=$PATH:/opt/jdk1.8.0_191/bin:/opt/jdk1.8.0_191/jre/bin

Also add the above commands to /etc/bashrc file to auto set environment variables on the system boot.

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