1. 添加PPA
sudo add-apt-repository ppa:webupd8team/java sudo apt-get update
2.安装oracle-java-installer
//jdk7 sudo apt-get install oracle-java7-installer //jdk8 sudo apt-get install oracle-java8-installer
3.设置系统默认jdk
//JDk7 sudo update-java-alternatives -s java-7-oracle //JDK8 sudo update-java-alternatives -s java-8-oracle
4.jdk之间的版本切换
//jdk8 切换到jdk7 sudo update-java-alternatives -s java-7-oracle //jdk7 切换到jdk8 sudo update-java-alternatives -s java-8-oracle
5.测试jdk 是是否安装成功
java -version javac -version