安裝python-software-properties
$sudo apt-get install python-software-properties
$sudo apt-get install software-properties-common首先添加ppa
$ sudo add-apt-repository ppa:webupd8team/java然後更新系統
$ sudo apt-get update最後開始安裝
$ sudo apt-get install oracle-java8-installer
$ java -version
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) Server VM (build 25.5-b02, mixed mode)java版本切換
sudo update-java-alternatives -s java-8-oracle