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$ mkdir -p /opt/java
$ cd /opt/java
 
$ wget --no-cookies --no-check-certificatec --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn/java/jdk/8u161-b12/2f38c3b165be4555a1fa6e98c45e0808/jdk-8u161-linux-x64.tar.gz"
 
$ tar xzf jdk-8u161-linux-x64.tar.gz
  
$ chown -R root: jdk1.8.0_*
  
-- for JAVA
$ alternatives --install /usr/bin/java java /opt/jdk1.8.0_161/bin/java 1
  
-- for JAR
$ alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_161/bin/jar 1
 
-- for JAVAC
$ alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_161/bin/javac 1
$ alternatives --set javac /opt/jdk1.8.0_161/bin/javac
  
$ rm /opt/jdk-8u161*.tar.gz
$ echo "Setting JAVA variables…"
 
$ export JAVA_HOME=/opt/jdk1.8.0_161
$ export JRE_HOME=/opt/jdk1.8.0_161/jre
$ export PATH=$PATH:/opt/jdk1.8.0_161/bin:/opt/jdk1.8.0_161/jre/bin