Runtime.getSystem.exec() function waits for child

Runtime.getSystem.exec() waits for child process to complete .. I do not want to wait for the child process to complete ..what is the option which has to be used ?

This '.' delimited function naming stuff is a pita. Java is a hog imho. The answer is to use whatever analog to waitpid with wnohang as an option is available.

Can you eloborate first 2 sentences ? I did not get it.