一、安装
yum install java
二、设置环境
which java
ls -ltr /usr/bin/java
ls -ltr /etc/alternatives/java
vim /etc/profile
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export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
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三、验证
java -version
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