java11

java -version
which java
ls /usr/bin/java -l
sudo update-alternatives --config java



https://dzone.com/articles/installing-openjdk-11-on-ubuntu-1804-for-real
% wget https://download.java.net/java/GA/jdk11/28/GPL/openjdk-11+28_linux-x64_bin.tar.gz -O /tmp/openjdk-11+28_linux-x64_bin.tar.gz
% sudo tar xfvz /tmp/openjdk-11+28_linux-x64_bin.tar.gz --directory /usr/lib/jvm
% rm -f /tmp/openjdk-11+28_linux-x64_bin.tar.gz

$ /usr/lib/jvm/jdk-11/bin/java -version

% sudo sh -c 'for bin in /usr/lib/jvm/jdk-11/bin/*; do update-alternatives --install /usr/bin/$(basename $bin) $(basename $bin) $bin 100; done'
% sudo sh -c 'for bin in /usr/lib/jvm/jdk-11/bin/*; do update-alternatives --set $(basename $bin) $bin; done'


% sudo apt-get install --only-upgrade default-jdk
% update-alternatives --config java



export JAVA_HOME=/usr/lib/jvm/jdk-11