1.添加ppa
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
2.安裝oracle-java-installer
jdk7 sudo apt-get install oracle-java7-installer
jdk8 sudo apt-get install oracle-java8-installer
3.設置系統默認jdk
JDk7 sudo update-java-alternatives -s java-7-oracle
JDK8 sudo update-java-alternatives -s java-8-oracle
如果即安裝了jdk7,又安裝了jdk8,要實現兩者的切換,可以:
jdk8 切換到jdk7 sudo update-java-alternatives -s java-7-oracle
jdk7 切換到jdk8 sudo update-java-alternatives -s java-8-oracle
4.測試jdk 是是否安裝成功:
java -version
javac -version