java installion jdk8

sudo update-alternatives --config java       

download java from site only java 8

apt install default-jre              # version 2:1.11-72, or
apt install openjdk-11-jre-headless  # version 11.0.20.1+1-0ubuntu1~20.04
apt install openjdk-13-jre-headless  # version 13.0.7+5-0ubuntu1~20.04
apt install openjdk-16-jre-headless  # version 16.0.1+9-1~20.04
apt install openjdk-17-jre-headless  # version 17.0.8.1+1~us1-0ubuntu1~20.04
apt install openjdk-8-jre-headless   # version 8u382-ga-1~20.04.1

terminal
java --version
cd /usr/lib/jvm
sudo tar -xvzf ~/Downloads/jdk-8u201-linux-x64.tar.gz
cd /usr/lib/jvm/jdk1.8.0_201
sudo nano /etc/enviroment
(add to path)
:/usr/lib/jvm/jdk1.8.0_201/bin:/usr/lib/jvm/jdk1.8.0_201/db/bin:/usr/lib/jvm/jdk1.8.0_201/jre/bin/

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_201/jre/bin/java" 1711

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_201/bin/javac" 1711

sudo update-alternatives --set java /usr/lib/jvm/jdk1.8.0_201/bin/javac
sudo update-alternatives --config java
choose 2
java -version

:/usr/lib/jvm/java-1.8.0-openjdk-amd64/bin:/usr/lib/jvm/jdk1.8.0_201/db/bin:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/bin/

/usr/lib/jvm/java-1.8.0-openjdk-amd64

mousepad /etc/enviroment
J2SDKDIR="/usr/lib/jvm/jdk1.8.0_381"
J2REDIR="/usr/lib/jvm/jdk1.8.0_381jre"
JAVA HOME="/usr/lib/jvm/jdk1.8.0_381"
DERBY HOME="/usr/lib/jvm/jdk1.8.0_381/db"

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_381/jre/bin/java" 0
sudo update-alternatives --install "/usr/bin/java" "javac" "/usr/lib/jvm/jdk1.8.0_381/bin/javac" 0
sudo update-alternatives --set java /usr/lib/jvm/jdk1.8.0_381/bin/java
sudo update-alternatives --set javac /usr/lib/jvm/jdk1.8.0_381/bin/javac

sudo update-alternatives --config java       

alpine os

apk add openjdk8
java -version