1.Java下載地址

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

2.解壓

tar -zxvf jdk-8u181-linux-x64.tar.gz

3.新建資料夾

sudo mkdir /usr/java

 4.移動檔案

sudo mv ./jdk1.8.0_181 /usr/java

sudo gedit /etc/profile

 5.新增PATH

export JAVA_HOME=/usr/java/jdk1.8.0_181
export JRE_HOME=/usr/java/jdk1.8.0_181/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
 

6.使環境變數生效 

source /etc/profile

7.檢視Java版本資訊