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Go to google and search for Java8 Download. Click on the first link that belongs to oracle.

List of commands to install Java JDK on Linux is listed below

Extract the donwnloaded tar file to opt directory

$ sudo tar -xf filename.tar.gz -C /opt/

Set the path for java8

 $ sudo update-alternatives --install "/usr/bin/java" "java" "/opt/jdk1.8.0_321/bin/java" 1

Change the java8 as default

$ sudo update-alternatives --config java

Check the java version

$ java -version

This was the List of commands to install Java8 in Linux or Kali Linux.