ubuntu 20.04 安装卸载Java/JDK

布满荆棘的人生 2023-09-25 21:33 21阅读 0赞

### 一、安装 ###

下载jdk安装包，url：https://www.oracle.com/java/technologies/downloads/

![a92407f843a68431bcfe6c3436c6fbf6.png][]

解压安装包

![fc77a07c1ac743938653f28c33246d33.png][]

root@Beyond-PC:/opt/software# tar -zxvf jdk-8u212-linux-x64.tar.gz -C /opt/module/

配置系统环境变量，编辑/etc/profile文件，在文件的末尾添加一下信息，保存退出：

root@DESKTOP-1N42TVH:/usr/local/java/jdk1.8.0_331# vim /etc/profile
    #java env
    export JAVA_HOME=/usr/local/java/jdk1.8.0_331
    export JRE_HOME=$JAVA_HOME/jre
    export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:$JRE_HOME/lib
    export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin

![a2e68674f2d90f992c20565fe9d86e8a.png][]

6、使用source /etc/profile命令使刚才配置的生效

root@DESKTOP-1N42TVH:/usr/local/java/jdk1.8.0_331# source /etc/profile

7、测试配置效果

root@DESKTOP-1N42TVH:/usr/local/java/jdk1.8.0_331# java -version
    java version "1.8.0_331"
    Java(TM) SE Runtime Environment (build 1.8.0_331-b09)
    Java HotSpot(TM) 64-Bit Server VM (build 25.331-b09, mixed mode)
    root@DESKTOP-1N42TVH:/usr/local/java/jdk1.8.0_331# javac -version
    javac 1.8.0_331
    root@DESKTOP-1N42TVH:/usr/local/java/jdk1.8.0_331# echo $JAVA_HOME
    /usr/local/java/jdk1.8.0_331
    root@DESKTOP-1N42TVH:/usr/local/java/jdk1.8.0_331# echo $JRE_HOME
    /usr/local/java/jdk1.8.0_331/jre
    root@DESKTOP-1N42TVH:/usr/local/java/jdk1.8.0_331# echo $CLASSPATH
    .::/usr/local/java/jdk1.8.0_331/lib:/usr/local/java/jdk1.8.0_331/jre/lib

#### 3、测试是否安装好 ####

java -version

### 二、卸载 ###

#### 1、检查安装的jdk ####

[dpkg][] \--list | grep -i jdk

#### 2、移除安装的jdk ####

#### apt-get purge openjdk\* ####

#### 3、卸载 OpenJDK 相关包 ####

apt-get purge icedtea-\* openjdk-\*

#### 4、再次检查 ####

dpkg --list | grep -i jdk

### 原文转载 ###

https://www.cnblogs.com/easonliu/p/3726993.html  
https://www.cnblogs.com/beilong/p/15821272.html

[a92407f843a68431bcfe6c3436c6fbf6.png]: https://img-blog.csdnimg.cn/img_convert/a92407f843a68431bcfe6c3436c6fbf6.png
[fc77a07c1ac743938653f28c33246d33.png]: https://img-blog.csdnimg.cn/fc77a07c1ac743938653f28c33246d33.png
[a2e68674f2d90f992c20565fe9d86e8a.png]: https://img-blog.csdnimg.cn/img_convert/a2e68674f2d90f992c20565fe9d86e8a.png
[dpkg]: https://so.csdn.net/so/search?q=dpkg&spm=1001.2101.3001.7020