[root@st152 /usr/bin]# ll |grep java
lrwxrwxrwx 1 root root 22 Nov 28 22:14 java -> /etc/alternatives/java
lrwxrwxrwx 1 root root 23 Nov 28 22:14 javac -> /etc/alternatives/javac
lrwxrwxrwx 1 root root 25 Nov 28 22:14 javadoc -> /etc/alternatives/javadoc
lrwxrwxrwx 1 root root 23 Nov 28 22:14 javah -> /etc/alternatives/javah
lrwxrwxrwx 1 root root 23 Nov 28 22:14 javap -> /etc/alternatives/javap
[root@st152 /usr/bin]# ll /etc/alternatives/java
lrwxrwxrwx 1 root root 73 Nov 28 22:14 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.el7_4.x86_64/jre/bin/java
yum安装的JDK的没有配置环境变量但是在/usr/bin下面都做了软链接
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