How to do a ping with ICMP in Java under Linux?

Does anyone know an easy way to do a ping with ICMPs under Linux? I did it under Windows, but under Linux, I've got some issues. I need a procedure that sends a ping with a id number and a seq number and another function pong that waits for a reply and returns the seq and id of the packets it received.
if anyone did this, please tell me how. I know it should be a native method, but how do I implement it...

rigth, i thought of that. but imagine that i have something like 100 hosts wich i must ping something like 20 times and get all the results in something like 5 seconds.
so i don't think that runtime will be a solution because that kind of pings tend to be safe and wait 1 sec between 2 succesive pings in order to prevent a flood.
i already did it in windows with a native dll. but i'm not so experienced in linux... :( so, if anyone can help...please do

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