安装:

  yum -y install java-1.7.0-openjdk-devel.x86_64

环境变量:

vi /etc/profile

export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.241-2.6.20.0.el7_7.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile

查看java版本:

java -version

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