openjdk tar包下载地址
OpenJDK： http://jdk.java.net/java-se-ri/11
卸载已有openjdk
查看
rpm -qa | grep java
rpm -qa | grep jdk
批量卸载
rpm -qa | grep jdk | xargs rpm -e --nodeps
rpm -qa | grep java | xargs rpm -e --nodeps在线安装方式
# 可以不用执行，查找安装包
yum search java-11-openjdk
# 安装
yum install -y java-11-openjdk java-11-openjdk-devellink: https://www.jb51.net/article/224194.htm