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yum安装jdk的好处就是不需要手动再配置环境变量,所有的变量都是自动生成
如果没有信息输出,则表示没有安装jdk
rpm -qa |grep java
rpm -qa |grep jdk
rpm -qa |grep gcj
如果存在则执行命令删除和卸载相关信息
rpm -qa | grep java | xargs rpm -e --nodeps
yum search java*
yum install java-1.8.0-openjdk* -y
java -version
[root@localhost jvm]# cd /usr/lib/jvm
[root@localhost jvm]# ll
total 0
drwxr-xr-x. 3 root root 17 May 27 09:52 java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64
lrwxrwxrwx. 1 root root 21 May 27 09:53 jre -> /etc/alternatives/jre
lrwxrwxrwx. 1 root root 27 May 27 09:53 jre-1.8.0 -> /etc/alternatives/jre_1.8.0
lrwxrwxrwx. 1 root root 35 May 27 09:53 jre-1.8.0-openjdk -> /etc/alternatives/jre_1.8.0_openjdk
lrwxrwxrwx. 1 root root 51 May 27 09:53 jre-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64 -> java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64/jre
lrwxrwxrwx. 1 root root 29 May 27 09:53 jre-openjdk -> /etc/alternatives/jre_openjdk
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