卸载penjdk

# 查看安装包

rpm -qa | grep openjdk

#卸载

rpm -e --nodeps `rpm -qa | grep openjdk`

1、准备JDK安装包

cat /etc/redhat-release

网址：

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

1）新建文件夹

cd /home/rhr/

mkdir soft

cd soft/

mkdir jdk

cd jdk

2）上传文件

tar -zxvf jdk-8u191-linux-x64.tar.gz

vi /etc/profile

　　在文档最后加上

export JAVA_HOME=/home/rhr/soft/jdk/jdk1..0_191

export PATH=$JAVA_HOME/bin:$PATH

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

重启配置文件

source /etc/profile

java -version