How to run sequential commands by runtime or whatever in java?

I'm doing a compile function in java GUI and need to run several commands one by one, how can i do this and how can i know that the previous command has been done and finished?
commands like
make ....
make ....
make ....
then do
./run.x ....
thanks a lot!

THe Process object that Runtime.exec method returns has a method called waitFor. Calling it makes the currently executing Java thread wait for the process to exit.
(apidoc: http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Process.html#waitFor())

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How to run sequential commands by runtime or whatever in java?

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