①sudo apt-get update
②sudo apt-get install default-jre
③sudo apt-get install default-jdk
④sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
⑤sudo apt-get install oracle-java8-installer
⑥sudo update-alternatives --config java
⑦sudo vim /etc/environment
在此文件夹下添加以下内容:
JAVA_HOME="/usr/lib/jvm/java-8-oracle"
⑧source /etc/environment
⑨echo $JAVA_HOME
⑩java -version