CentOS7安装部署Java11

1. 查看是否已安装openjdk

java -version

yum list installed | grep java

2. 已安装，卸载，否则跳过该步骤

yum -y remove java-1.7.0-openjdk.x86_64

yum -y remove java-1.7.0-openjdk-headless.x86_64

yum -y remove java-1.8.0-openjdk.x86_64

yum -y remove java-1.8.0-openjdk-headless.x86_64

3. 下载 jdk 安装包

https://www.oracle.com/java/technologies/javase/jdk11-archive-downloads.html

4. 解压

mkdir /opt/java && tar -zxvf jdk-11.0.18_linux-x64_bin.tar.gz -C /opt/java

5. 配置环境变量

vim /etc/profile

export JAVA_HOME=/opt/java/jdk-11.0.18
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/tools.jar
export PATH=$PATH:${JAVA_HOME}/bin

6. 刷新环境变量

source /etc/profile

7. 查看java版本

java -version

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