jdk8
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | sudo /usr/bin/debconf-set-selections
sudo update-java-alternatives -s java-8-oracle
java -version
javac -version【oracle|oracle java jdk install】参考：https://www.cnblogs.com/a2211009/p/4265225.html
