一、下载安装包

选择适合自己系统的jdk版本

或者使用wget命令下载：wget命令如下

wget --user=orcale账号 --ask-password 下载链接
我的orcale账号为295135885@qq.com，下载链接可以右键自己要下载的jdk文件，复制链接地址获得
wget --user=295135885@qq.com --ask-password https://download.oracle.com/otn/java/jdk/8u231-b11/5b13a193868b4bf28bcb45c792fce896/jdk-8u231-linux-x64.tar.gz
回车后输入oracle账号登录密码即可开始下载

二、解压安装包

将安装包解压到指定目录下

tar -zxvf jdk-8u231-linux-x64.tar.gz  -C /usr/jdk

三、修改环境变量

用vim编辑器来编辑profile文件，按i进入编辑

vim /etc/profile

添加一下内容，具体根据自己的目录进行设置

export JAVA_HOME=/usr/jdk/jdk1.8.0_231
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib:$CLASSPATH
export JAVA_PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin
export PATH=$PATH:${JAVA_PATH}

esc退出编辑，保存并退出(输入 :wq 后回车)

重新加载profile文件

source /etc/profile

四、测试石是否安装成功

1. 使用javac命令

[root@iz8vb4efgq8tzqwlylia5uz jdk1.8.0_231]# javac
Usage: javac <options> <source files>
where possible options include:
  -g                         Generate all debugging info
  -g:none                    Generate no debugging info
  -g:{lines,vars,source}     Generate only some debugging info
  -nowarn                    Generate no warnings
  -verbose                   Output messages about what the compiler is doing
  -deprecation               Output source locations where deprecated APIs are used
  -classpath <path>          Specify where to find user class files and annotation processors
  -cp <path>                 Specify where to find user class files and annotation processors
  -sourcepath <path>         Specify where to find input source files
  -bootclasspath <path>      Override location of bootstrap class files
  -extdirs <dirs>            Override location of installed extensions
  -endorseddirs <dirs>       Override location of endorsed standards path
  -proc:{none,only}          Control whether annotation processing and/or compilation is done.
  -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process
  -processorpath <path>      Specify where to find annotation processors
  -parameters                Generate metadata for reflection on method parameters
  -d <directory>             Specify where to place generated class files
  -s <directory>             Specify where to place generated source files
  -h <directory>             Specify where to place generated native header files
  -implicit:{none,class}     Specify whether or not to generate class files for implicitly referenced files
  -encoding <encoding>       Specify character encoding used by source files
  -source <release>          Provide source compatibility with specified release
  -target <release>          Generate class files for specific VM version
  -profile <profile>         Check that API used is available in the specified profile
  -version                   Version information
  -help                      Print a synopsis of standard options
  -Akey[=value]              Options to pass to annotation processors
  -X                         Print a synopsis of nonstandard options
  -J<flag>                   Pass <flag> directly to the runtime system
  -Werror                    Terminate compilation if warnings occur
  @<filename>                Read options and filenames from file

2. 使用java -version 查看jdk版本

[root@iz8vb4efgq8tzqwlylia5uz jdk1.8.0_231]# java -version
openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-b09)
OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)

参考博客：https://www.cnblogs.com/xuliangxing/p/7066913.html