Getting/Sending input/output from terminal

Here's the problem that I'm having. I'm using Netbeans 6.0 and my desktop app is running in Linux Centos 5. I need to use runtime and exec to execute a compile command (compile_cmd). This works fine except that after the compile has finished it asks for the user to hit enter to continue. When I run the command it of course hangs my app since it's waiting for the continue. Is there any way to see when the compile has finished and to send a cr to continue? Thanks for any help.