JAVA

install java on raspberry pi

sudo apt update
sudo apt install default-jdk

install java 11 jdk raspberry pi

sudo wget http://cdn.azul.com/zulu-embedded/bin/zulu11.31.16-ca-jdk11.0.3-linux_aarch32hf.tar.gz
sudo tar -xfvz zulu11.31.16-ca-jdk11.0.3-linux_aarch32hf.tar.gz
sudo rm *.tar.gz

install java 11 jdk raspberry pi

sudo mkdir /opt/jdk
cd /opt/jdk

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