1.手动安装

1.下载jdk-8u291-linux-x64.tar.gz

https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

2.上传

3.解压

tar -xvf jdk-8u291-linux-x64.tar.gz

4.移动到/usr/local/java

mv jdk1.8.0_291 /usr/local/java

5.编辑环境变量

vim /etc/profile
增加
JAVA_HOME=/usr/local/java/jdk1.8.0_291
CLASSPATH=$JAVA_HOME/lib/
PATH=$PATH:$JAVA_HOME/bin
export PATH JAVA_HOME CLASSPATH
生效
source /etc/profile

6.检查

java -version

2.yum安装

1.查看要安装的版本
yum -y list java*
2.安装
yum install -y java-1.8.0-openjdk.x86_64