查询版本

yum search java|grep jdk

image.png

安装

···
yum install java-1.8.0-openjdk
···
安装Java1.8
按两次Y确认

cd /usr/lib/jvm

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配置环境变量

usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-1.el7_9.x86_64
vim /etc/profile

export JAVA_HOME=usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-1.el7_9.x86_64
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

测试

java -version