Waiting a Dos Command?

Question

Hi;
In one of our projects, we have to call a dos command in java. That seems ok however there is a problem about code. It gives an exception because the remaning program goes without waiting the dos command's completion.
Runtime r = Runtime.getRuntime();
r.exec("cmd /C sort 1.txt /O 2.txt");Above code, makes a sort in 1.txt and saves it to 2.txt.. My code goes without waiting the 2.txt to be created and gives an exception like couldn't found 2.txt . Thanks for any help, i hope i could explained clearly what i wanted to ask..

Answer 1

Yea you're right thanks for answer. But yesterday Petter a.k.a wildfrog from Codeguru forums posted this solutions. Anyway i'm putting it here if someone needs it.
To wait until the 'child process' has completed, you can do something like this:
Runtime r = Runtime.getRuntime();
Process p = r.exec("cmd /C sort 1.txt /O 2.txt");
// wait for it to complete
try
    p.waitFor();
} catch (InterruptedException e)
    // wait was interrupted
}- petter