1、安装jre 和 jdk
sudo apt-get install default-jre
sudo apt-get install default-jdk
2、源安装
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
sudo apt-get install oracle-java8-set-default
如果发生错误
add-apt-repository: command not found
执行
sudo apt-get install software-properties-common python-software-properties
3、修改环境变量
vim /root/.bashrc
export JAVA_HOME=/usr/lib/jvm/java-8-oracleexport CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport PATH=$PATH:$JAVA_HOME/binexport JAVA_HOME PATH CLASSPATH
4、生效, 检查
source ~/.bashrc
java -version
