sudo add-apt-repository ppa:webupd8team/java
vi /etc/apt/sources.list.d/webupd8team-java-wheezy.list
deb http://ppa.launchpad.net/webupd8team/java/ubuntu
precise main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu
precise main
apt-get update
apt-get install oracle-java8-installer oracle-java8-set-default
apt-get remove openjdk-*-jre
原文：http://www.cnblogs.com/leisurely/p/3737191.html