ubuntu安装JDK

1、sudo apt-get purge openjdk-*
2、sudo apt-get install software-properties-common
3、sudo apt autoremove
4、sudo apt-get update
5、sudo add-apt-repository ppa:webupd8team/java
6、sudo apt-get install oracle-java8-installer
7、sudo apt-get install oracle-java8-set-default
8、java -version
若第6步出现错误：Package 'oracle-java8-installer' has no installation candidate
请执行以下步骤
sudo apt-get install python-software-properties 
sudo add-apt-repository ppa:webupd8team/java 
sudo apt-get update