linux rhel8 安装java开发环境

1、系统版本、java环境查看

[root@linuxprobe home]# cat /etc/system-release  ## 查看系统版本
Red Hat Enterprise Linux release 8.0 (Ootpa)
[root@linuxprobe home]# java    ##没有java命令
bash: java: command not found...
Failed to search for file: Cannot update read-only repo
[root@linuxprobe home]# java -version   ## 没有java版本信息
bash: java: command not found...
Failed to search for file: Cannot update read-only repo
[root@linuxprobe home]# which java   ##未安装java
/usr/bin/which: no java in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
[root@linuxprobe home]# rpm -qa | grep jdk   ## 没有java
[root@linuxprobe home]# echo $JAVA_HOME   ##没有java环境变量