1.通过which java 找到变量的路径 [admin@web_001233 ~]$ which java /usr/bin/java 2.找到java的路径 [admin@web_001233 ~]$ ls -lrt /usr/bin/java lrwxrwxrwx 1 root root 26 Nov 11 2015 /usr/bin/java -> /usr/java/default/bin/java 3.可以看到这里是通过软连接来切换java版本的。 [admin@web_001233 ~]$ ll /usr/java/ total 8 lrwxrwxrwx 1 root root 16 Nov 11 2015 default -> /usr/java/latest drwxr-xr-x 8 root root 4096 Nov 11 2015 jdk1.7.0_75 drwxr-xr-x 8 root root 4096 Jun 13 2017 jdk1.8.0_60 lrwxrwxrwx 1 root root 21 Nov 11 2015 latest -> /usr/java/jdk1.7.0_75 [admin@web_001233 ~]$