Using Runtime exec() to open java on other directory

HI, I have a little problem and i hope everyone can help me out abit. You see when u use Runtime.exec(), how to you use it so that when the file you want to open is different from your program directory.
For example,
my program is in c:\windows\desktop
but the file i want to open eg. Somthing.class is in c:\my documents\
How do I open it using java and i wish to open the file using the java command. Thank a million

Runtime.getRuntime().exec("cmd /c start /d\"C:\\my documents\" java.exe Somthing");
Can someone explain the /c start /d\"C:\Mydocuments\" java.exe Somthing.
And I try to use ping in RunTime.exec,how do I construct the string?And how do i get the result of the ping?
Thanks

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    thx guys for ur replies . The issue was because of some browser security system ( or so they said . ).However i'm still puzzled about the 'waiting for the stream to finish' part .
    paul.miner wrote:
    {I think the process is allowed to end with output still in the >>buffers, ..so this would be expected. You should be waiting for >>your .streams to finish, since that's what you really >>care .about. .Also, .you need to add synchronization between your >>threads so you can accurately retrieve "MAC". Also, do not break out >>of the loop when you find what you're looking for, you should >>continue .reading until the end of the stream.Wasn't I suppose to be reading out of the stream to prevent an overflow?Also the break is done there are multiple lines like 'Physical address .....: xxxxxxxxxx ' in the output , and the macid is the first one.About the ProcessBuilder , I'll look into it . Thx for your advice.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

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    india

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