Minimizing the java command window?

I'm running a excutable jar file:'java -jar myExe.jar' i leave the command window open, and task manager window open next to it. when i minimize my command window, i see the CPU usage for the java process go down. why does it do that?
[258 byte] By [llpindda] at [2007-11-27 3:23:04]
# 1
Nobody has experienced this before?
llpindda at 2007-7-12 8:25:50 > top of Java-index,Desktop,Runtime Environment...