http://www.oracle.com/technetwork/java/javase/downloads/ より jdk-11.0.1_linux-x64_bin.tar.gz をダウンロード。
wget -r -nd ‘ftp://ftp.nara.wide.ad.jp/pub/Linux/slackware/slackware64-current/extra/source/java/’
sh ./java.SlackBuild jdk-11.0.1_linux-x64_bin.tar.gz
installpkg /tmp/jdk-11.0.1_linux-i586-1.txz
cat << EOF >/etc/profile.d/openjdk.sh
#!/bin/sh
export JAVA_HOME=/usr/lib/java
export MANPATH=”\${MANPATH}:\${JAVA_HOME}/man”
export PATH=”\${PATH}:\${JAVA_HOME}/bin:\${JAVA_HOME}/jre/bin”
EOF
chmod +x /etc/profile.d/openjdk.sh