Java: download & install Java on Linux

[last updated: 2019-05-23]
go to: Java
go to: Java: download & install on Linux - mostly unsuccessful learning
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• As always before making changes:
  $ sudo apt-get update
  $ sudo apt-get dist-upgrade
• Open command terminal and move to /usr directory
  $ sudo mkdir java
  $ cd java
  $ sudo apt-get install openjdk-8-jdk
• $ java -version
  should report something similar to:
  openjdk version "1.8.0_212"
  OpenJDK Runtime Environment (build 1.8.0_212-8u212-b03-0ubuntu1.16.04.1-b03)
  OpenJDK 64-Bit Server VM (build 25.212-b03, mixed mode)
• Edit profile:
  $ cd /etc
  $ sudo nano profile
  add the following lines to the very end of the file:
     JAVA_HOME=/usr/java/openjdk-8-jdk
     PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
     export JAVA_HOME
     export PATH
• Then: ctrl-o to write/save, then press enter
  ctrl-x to exit nano
• $ . /etc/profile to reload profile
• However: This changes the prompt color from green to white.
  And while the PATH change is active in this command window, it is NOT valid in a different or new window.
  You must reboot for the change to work in all cases.
• Test Java with 'Hello World'

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