install java in raspberry pi code example

Example 1: install java 11 jdk raspberry pi

sudo mkdir /opt/jdk
cd /opt/jdk

Example 2: install java 11 jdk raspberry pi

sudo update-alternatives --install /usr/bin/java java /opt/jdk/zulu11.31.16-ca-jdk11.0.3-linux_aarch32hf/bin/java 1
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk/zulu11.31.16-ca-jdk11.0.3-linux_aarch32hf/bin/javac 1