how to install jdk or java on centos 7

yum -y update

yum install java-1.8.0-openjdk

yum install java-1.8.0-openjdk -y

java -version

update-alternatives --config java

vi .bash_profile

       ### 하단에 추가 ###

       export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64/jre/bin/java

       ### java -version 으로 나오는 버전을  export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk 뒤에 삽입해야함

source .bash_profile

echo $JAVA_HOME
      /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64/jre/bin/java