卸载open jdk

#查看jdk
[root@localhost tools]# rpm -qa | grep jdk
java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64
java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64
java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64
#卸载jdk
[root@localhost tools]# rpm -e --nodeps java-1.8.0-openjdk
[root@localhost tools]# rpm -e --nodeps java-1.8.0-openjdk-headless
[root@localhost tools]# rpm -e --nodeps java-1.7.0-openjdk-headless
[root@localhost tools]# rpm -e --nodeps java-1.7.0-openjdk
[root@localhost tools]# rpm -qa | grep jdk
#查看java
[root@localhost tools]# rpm -qa | grep java
javapackages-tools-3.4.1-11.el7.noarch
tzdata-java-2015g-1.el7.noarch
python-javapackages-3.4.1-11.el7.noarch
#卸载java
[root@localhost tools]# rpm -e --nodeps tzdata-java
[root@localhost tools]# rpm -e --nodeps python-javapackages
[root@localhost tools]# rpm -e --nodeps javapackages-tools
[root@localhost tools]# rpm -qa | grep java
[root@localhost tools]# 

安装jdk

#上传jdk包，解压
[root@localhost tools]# tar -zxvf jdk-8u231-linux-x64.tar.gz 
#设置文件的用户及所属组
[root@localhost local]# chown -R root:root jdk1.8.0_231/
#设置环境变量
[root@localhost jdk1.8.0_231]# vim /etc/profile
	export JAVA_HOME=/ruanjian/jdk1.8.0_191#解压后jdk包的路径
	export PATH=$PATH:$JAVA_HOME/bin
#立即生效
[root@localhost jdk1.8.0_231]# source /etc/profile
#查看jdk版本
[root@localhost jdk1.8.0_231]# java -version
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)