Is there a pure Java way to get Filesystem's space?

waiting for help

I've since got a (new to me) router, a RV082 (which gives me 8 ports, I needed more than 4 anyway), and it has a feature, under "system management" quoting from the manual:
Network Service Detection:
Optionally, check the box to allow the router to detect network connectivity by pinging specified devices. Then enter the settings below. Uncheck the box to disable this feature.
•Retry count: Enter the number of times to ping a device. The default is 5.
•Retry timeout: Enter the number of seconds to wait between pings. The default is 30 seconds.
I changed this to 400 seconds, and I think the cable modem is seeing the 2nd ping. I tested my little system a couple times by turning off its power mains feed circuit breaker, off for about 20 seconds, and back on again. It seems to come up correctly,

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