ubuntu16.04安装jdk1.8

官网下载安装包地址: http://www.oracle.com/technetwork/articles/javase/index-jsp-138363.html

安装完解压缩到指定目录(以jdk-8u161-linux-x64.tar.gz为例)

1.创建目录

sudo mkdir /usr/local/java

2.解压到上面创建的目录

 sudo tar -zxvf jdk-8u161-linux-x64.tar.gz -C /usr/local/java

3.修改环境变量

sudo vim /etc/profile

在文件末尾加上下面的代码
#设置jdk环境
export JAVA_HOME=/usr/local/java/jdk1.8.0_161 #目录要换成自己解压的jdk目录
export JRE_HOME=${JAVA_HOME}/jre  
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
export PATH=${JAVA_HOME}/bin:$PATH 

4.使环境变量生效

source /etc/profile

5.最后，测试jdk是否安装成功

java -version

java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)
tyson@tyson:~/Downloads$ sudo vim /etc/profile
tyson@tyson:~/Downloads$ source /etc/profile
tyson@tyson:~/Downloads$ java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)

安装成功！