How can I catch message displayed on MS-Dos window?

[Xiaojian Liu]

I can execute EXE files, for example java.exe
and javac.exe, whatever,from my application.
I want to do two things (like Kawa IDE):

1. to capture the output of the EXEs
2. to run the EXE without MS-Dos window explicitly
displayed

How can I do that?

Thanks.