[root@localhost ~]# which java/usr/bin/java

[root@localhost ~]# ls -lrt /usr/bin/javalrwxrwxrwx. 1 root root 22 10月 10 08:06 /usr/bin/java -> /etc/alternatives/java

[root@localhost ~]# ls -lrt /etc/alternatives/javalrwxrwxrwx. 1 root root 73 10月 10 08:06 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64/jre/bin/java

[root@localhost ~]# cd /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64[root@localhost java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64]# ll總用量 4drwxr-xr-x. 2 root root 4096 10月 10 14:53 bindrwxr-xr-x. 3 root root 132 10月 10 14:53 includedrwxr-xr-x. 4 root root  28 10月 10 08:03 jredrwxr-xr-x. 3 root root 144 10月 10 14:53 libdrwxr-xr-x. 2 root root 204 10月 10 14:53 tapset[root@localhost java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64]#