##1.下載,解壓,轉移java
下載URL:https://java.com/zh_CN/download/manual.jsp
hjm@hjm-VirtualBox:/$ tar xvf /home/hjm/下載/jre-8u91-linux-i586.tar.gz
hjm@hjm-VirtualBox:/$ sudo mv /home/hjm/下載/jre1.8.0_91 /usr/lib/jvm/jre1.8.0_91
##2.添加環境變量
hjm@hjm-VirtualBox:/$ sudo vim /home/hjm/.profile
##3.修改默認java
#添加到選項
hjm@hjm-VirtualBox:/$ sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-7-sun/bin/java 300
#手工配置默認jdk
hjm@hjm-VirtualBox:/$ sudo update-alternatives --config java
hjm@hjm-VirtualBox:/$ java -version