### Download JDK1.8 from Oracle official Website
cd /usr/      
mkdir java      
### chmod 777 java      
mv /home/abc/Downloads/jdk-8u211-linux-x64.tar.gz /usr/java/      
cd /usr/java      
tar -zxvf jdk-8u211-linux-x64.tar.gz

# 修改全局环境变量
vim /etc/profile      
      
# 安装目录      
export  JAVA_HOME="/usr/java/jdk1.8.0_211"      

export  CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export  JRE_HOME=$JAVA_HOME/jre    
export  PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH      

source /etc/profile