Enable Java 8 and Java 11 SDKs on Ubuntu

$ sudo apt install -y openjdk-8-jdk openjdk-11-jdk

$ vi .bashrc

JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::")
export JAVA_HOME
PATH=$PATH:$JAVA_HOME/bin
export PATH

$ source ~/.bashrc

$ echo $JAVA_HOME

sudo update-alternatives --config java

sudo update-alternatives --config javac

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