查看jdk的安裝路徑

[root@localhost /]# which java

/usr/bin/java

[root@localhost /]# ls -lrt /usr/bin/java

lrwxrwxrwx. 1 root root 22 Jun 26 03:33 /usr/bin/java -> /etc/alternatives/java

[root@localhost /]# ls -lrt /etc/alternatives/java

lrwxrwxrwx. 1 root root 71 Jun 26 03:33 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-7.b13.el7.x86_64/jre/bin/java

[root@localhost /]# cd /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-7.b13.el7.x86_64

[root@localhost java-1.8.0-openjdk-1.8.0.181-7.b13.el7.x86_64]# ls

jre

[root@localhost java-1.8.0-openjdk-1.8.0.181-7.b13.el7.x86_64]#

上圖紅框即為jdk的安裝路徑。