Help creating a simple line graph

Hi
Im very new to the Java language, yet have some background knowledge of C and C++.
i have a problem with an application i am developing for a university assignment, the program is to simply simulate a water pressured nuclear reaction. the main JFrame holds various JLabels that show the current core temperature, electricity produced etc. But i want to add a very simplistic line graph to the same window, it is to purely show a line that updates (no axis or labels). The graph is to illustrate how much electricity was produced on the current cycle of the reactor, the user can initiate each cycle by pressing a JButton.
i have found some info on drawing, but cannot find anything that helps.
Any info on how to do this (its only meant to be a samllish part of the main window), any code examples or sites that have a very relevant tutorial would be appreciated.
Sorry for the length of this, and if anyone needs any more info on this then let me know.
thanks

Cross posted,
http://forum.java.sun.com/thread.jsp?forum=54&thread=394494&tstart=0&trange=15

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