Command prompt window problem

Hi,
Can anyone tell me how to open a command prompt window from a Java GUI application? The application is started as a excutable JAR file and there is no command prompt window showing up in the beginning.
Thanks a lot
Wenly

Thank you guys, I have checked the doc and it seems the Runtime.getRuntime().exec(); will start a seperated process.What I need is to open a command prompt window in the same process of my application and display message on it by using System.out.println()
Is it possible?

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