add-apt-repository ppa:linuxuprising/java
apt-get update
apt-get install oracle-java10-installer oracle-java10-set-default
add-apt-repository ppa:webupd8team/java
apt-get update
apt-get install oracle-java8-installer
sudo nano /etc/profile
export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::") ( profile 하단에 추가 )
. /etc/profile