Connectivity of any network computer

hi all,
i am having problem in checking wheather any computer is up or not currently i am using Runntime class to do so by pinging the computer to check wheather it is up or not.
are their any other method to do so.
another problem is this that how can i get the subnet mask of a remote computer to checks its network address.
any help will be appriciated .
Regards

i have seen that code in that i again have to give the port i want that as we ping any host and we just write c:\>ping 10.10.5.100 and its check whether the host is replying or not this what i want in java program.

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