Linux卸载openjdk并安装Oracle jdk

### Linux卸载openjdk

 

```shell

#查看版本

java -version

 

显示如下: 自带的openjdk

openjdk version "1.8.0_275"

OpenJDK Runtime Environment (build 1.8.0_275-b01)

OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode)

 

#查看jdk安装软件

rpm -qa|grep java

 

显示如下:

java-1.8.0-openjdk-1.8.0.275.b01-0.el7_9.x86_64

javapackages-tools-3.4.1-11.el7.noarch

java-1.8.0-openjdk-headless-1.8.0.275.b01-0.el7_9.x86_64

python-javapackages-3.4.1-11.el7.noarch

tzdata-java-2020d-2.el7.noarch

 

#卸载openjdk   

#.noarch结尾的可以不用删除

rpm -e --nodeps java-1.8.0-openjdk-1.8.0.275.b01-0.el7_9.x86_64

rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.275.b01-0.el7_9.x86_6

```

 

### 安装Oracle jdk

 

官方下载地址: https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

下载Linux x86版本: jdk-8u275-linux-x64.tar.gz

 

```shell

 

#解压

tar -zxvf jdk-8u275-linux-x64.tar.gz

 

#查看目录

pwd

/home/software/jdk1.8.0_275

 

#设置环境变量

vim /etc/profile

#末尾添加

export JAVA_HOME=/home/software/jdk1.8.0_275

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

export PATH=$PATH:$JAVA_HOME/bin

 

:wq!

#保存退出

 

#使配置生效

source /etc/profile

```

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