傻瓜式操作

cd /myTest/JDK

tar -zxvf jdk-8u172-linux-x64.tar.gz

vi /etc/profile
#set java environment

export JAVA_HOME=/myTest/JDK/jdk1.8.0_172
export JRE_HOME=/myTest/JDK/jdk1.8.0_172/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$JAVA_HOME:$PATH

source /etc/profile

java -version

 完成!