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# JAVA 安装
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## 环境检查
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运行命令
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```shell
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java -version
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```
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显示结果如下，证明已安装过
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```shell
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openjdk version "1.8.0_161"
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OpenJdk Runtime Environment (build 1.8.0_161-b14)
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OpenJdk 64-Bit Server VM (build 25.161-b14, mixed mode)
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```
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如果对 Java 环境无特殊要求，可结束后续操作
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## 卸载 OpenJdk
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检查 OpenJdk 安装包，运行如下命令：
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```shell
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rpm -qa | grep java
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```
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系统显示结果如下：
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```shell
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java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64
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tzdata-java-2018c-1.el7.noarch
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python-javapackages-3.4.1-11.el7.noarch
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javapackages-tools-3.4.1-11.el7.noarch
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java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64
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```
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卸载OpenJdk，运行如下命令：
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```shell
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yum remove *openjdk* -y
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```
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查看卸载情况，再次输入上述检查命令：
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```shell
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rpm -qa | grep java
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```
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若显示结果如下，则证明已成功卸载 OpenJdk
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```shell
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tzdata-java-2018c-1.el7.noarch
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python-javapackages-3.4.1-11.el7.noarch
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javapackages-tools-3.4.1-11.el7.noarch
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```
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> 以上内容因不同的发型版本显示结果会有些许差异， 请自行判断
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## 安装Jdk
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下载 JDK 安装包 上传到指定目录
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创建路径
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```shell
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mkdir -p /usr/local/java
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```
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解压安装
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```shell
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tar -zxvf jdk-8u161-linux-x64.tar.gz -C /usr/local/java
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cd /usr/local/java && mv jdk1.8.0_161 8u161
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```
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设置环境变量
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```shell
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vi /etc/profile
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export JAVA_HOME=/usr/local/java/8u341
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export PATH=$PATH:$JAVA_HOME/bin
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```
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刷新环境变量
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```shell
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source /etc/profile
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```
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问题及解决方法：
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```shell
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# 执行 source 命令可能出现如下问题
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# sudo: source: command not found
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# 解决办法 注意使用拥有 root 权限的用户
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# 执行命令
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locate source /etc/profile
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# 显示如下
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locate: can not stat () `/var/lib/mlocate/mlocate.db': No such file or directory
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# 继续执行
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updatedb
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```
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检查是否安装成功。
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```shell
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java -version
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```
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查看环境变量
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```shell
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echo $JAVA_HOME
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```
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