安装python-software-properties

$sudo apt-get install python-software-properties
$sudo apt-get install software-properties-common

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首先添加ppa

$ sudo add-apt-repository ppa:webupd8team/java

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然后更新系统

$ sudo apt-get update

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最后开始安装

$ 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)

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java版本切换

sudo update-java-alternatives -s java-8-oracle

安装jdk8