1.添加仓库

在终端执行一下命令

sudo add-apt-repository ppa:openjdk-r/ppa

2.升级系统资源包并安装openjdk1.8

sudo apt-get update

sudo apt-get install openjdk-8-jdk

3.配置openjdk1.8

openjdk默认会安装在/usr/lib/jvm/java-8-openjdk-amd64，可以在~/.bashrc文件中进行jdk的配置

#export JAVA_HOME=/usr/lib/java/jdk6u45

#export JAVA_HOME=/usr/lib/java/jdk8u91

#export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64

#export JAVA_HOME=/usr/lib/java/jdk7u79

export JRE_HOME=${JAVA_HOME}/jre

export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

export PATH=${JAVA_HOME}/bin:$PATH

参考资料

http://blog.csdn.net/weirdo_c/article/details/50927712