[root@hadoop data]# which java
/usr/bin/java
[root@hadoop data]# ls -lrt /usr/bin/java
lrwxrwxrwx 1 root root 22 5月  13 15:27 /usr/bin/java -> /etc/alternatives/java
[root@hadoop data]# ls -lrt /etc/alternatives/java
lrwxrwxrwx 1 root root 61 5月  13 15:27 /etc/alternatives/java -> /usr/lib/jvm/java-11-openjdk-11.0.ea.28-7.el7.x86_64/bin/java