Ubuntu 16.04 Oracle JDK8安装

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

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

~$ sudo apt-get update

~$sudo apt-get install oracle-java8-installer

~$ java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)