Add doc for OpenJDK 8

java8.md

@@ -0,0 +1,28 @@
+# Java
+
+Install Java programming language to user .local directory using [AdoptOpenJDK](https://adoptopenjdk.net/) distribution.
+
+## Remove old version before installation
+
+```bash
+rm -rf $HOME/.local/openjdk-8
+```
+
+## Install latest binary release from repositories
+
+```bash
+LATEST_BINARY_LINK=$(curl -L 'https://api.adoptopenjdk.net/v2/latestAssets/nightly/openjdk8?os=linux&arch=x64&heap_size=normal&openjdk_impl=hotspot&type=jdk' --silent | jq -r '.[].binary_link')
+wget -qO openjdk-8.tar.gz "${LATEST_BINARY_LINK}" \
+  && tar -C $HOME/.local -xzf openjdk-8.tar.gz \
+  && mv $HOME/.local/jdk8* $HOME/.local/openjdk-8 \
+  && rm openjdk-8.tar.gz
+```
+
+## Set up environment variables
+
+```bash
+cat << EOF >> $HOME/.bashrc
+export JAVA_HOME=\$HOME/.local/openjdk-8
+export PATH=\$PATH:\$JAVA_HOME/bin
+EOF
+```