#删除已经安装版本
sudo update-alternatives --config java
rpm -qa | grep jdk | xargs yum -y remove
rpm -qa | grep java | xargs sudo yum -y remove
rpm -qa | grep jre | xargs sudo yum -y remove
yum -y update
#安装java8
yum install java-1.8.0-openjdk
#安装java11
yum install java-11-openjdk.x86_64