Executing files in java and writing arguments

Can someone give me the code in java (or c++) for executing a command-line program like telnet and then sending arguments to the program like:
>o
>localhost

Change the "writing" in the title to "sending".

Something like this?

In Java: Runtime.getRuntime().exec("telnet ahost 25");

I think in c++ it's: System("telnet ahost 25");

Cheers