1、安装jre 和 jdksudo apt-get install default-jresudo apt-get install default-jdk
2、源安装sudo add-apt-repository ppa:we水瑞侮瑜bupd8team/javasudo apt-get updatesudo apt-get install oracle-java8-installersudo apt-get install oracle-java8-set-default如果发生错误add-apt-repository: command not found执行sudoapt-getinstallsoftware-properties-commonpython-software-properties
3、修改环境变量vim /root/.bashrcexport 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 ~/.bashrcjava -version
