ubuntu16.04 纯自动安装jdk8 并自动设置环境变量 / ubuntu16.04 install jdk[8] and set environment path

来源：
https://itsfoss.com/install-java-ubuntu-1404/

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sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install java-common oracle-java8-installer -y

sudo apt-get install oracle-java8-set-default -y

source /etc/profile

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