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$ mkdir -p /opt/java
$ cd /opt/java
 
$ wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=a" "http://download.oracle.com/otn-pub/java/jdk/8u172-b11/a58eab1ec242421181065cdc37240b08/jdk-8u172-linux-x64.tar.gz"
 
$ tar xzf jdk-8u172-linux-x64.tar.gz
  
$ chown -R root: jdk1.8.0_*
  
-- for JAVA (in case you have another version of Java installed)
$ alternatives --install /usr/bin/java java /opt/java/jdk1.8.0_172/bin/java 1
  
-- for JAR (in case you have another version of Java installed)
$ alternatives --install /usr/bin/jar jar /opt/java/jdk1.8.0_172/bin/jar 1
 
-- for JAVAC (in case you have another version of Java installed)
$ alternatives --install /usr/bin/javac javac /opt/java/jdk1.8.0_172/bin/javac 1
$ alternatives --set javac /opt/java/jdk1.8.0_172/bin/javac
  
$ rm /opt/java/jdk-8u172*.tar.gz

-- setting JAVA variables
 
$ export JAVA_HOME=/opt/java/jdk1.8.0_172
$ export JRE_HOME=/opt/java/jdk1.8.0_172/jre
$ export PATH=$PATH:/opt/java/jdk1.8.0_172/bin:/opt/java/jdk1.8.0_172/jre/bin