dawei
1、按转jdk：
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
设置环境变量：
vim ～/.bashrc
export JAVA_HOME=/usr/lib/jvm/java-8-oracle
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
