/jdk/src/java.base/share/classes/java/
drwxr-xr-x [up]
drwxr-xr-x io
drwxr-xr-x lang
drwxr-xr-x math
drwxr-xr-x net
drwxr-xr-x nio
drwxr-xr-x security
drwxr-xr-x text
drwxr-xr-x time
drwxr-xr-x util