1.jdk安装(yum方式)
yum search java | grep -i --color jdkyum install

yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel
安装好后,测试:java -version

2. 查找安装目录(which java)

3.设置JAVA_HOME
vim /etc/profile
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.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
:wq
source /etc/profile
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