Robocode/Learning from Robots
This page suggest that you learn from other robots by downloading and examining the source code of robots.
Learning from other Robots
By now, you should know how to use the Robot editor and create robots. If not, you should follow the My First Robot Tutorial first. You will also want to look at some tutorials.
Eventually, though, you'll want to learn by examining code written by others. Some authors graciously include the source to their robots, and you can examine these robots using the Extract downloaded robot for editing tool, in the Robot Editor.
http://robocode.sourceforge.net/help/learning/extract.png
Simply select the robot you want to extract...
http://robocode.sourceforge.net/help/learning/extractdialog.png
Then click Extract to extract the .jar to the robots directory..
http://robocode.sourceforge.net/help/learning/extractresults.png
As you can see, the files in this example were extracted to C:\robocode\robots\rapture\. You can now open them up and look at them in the Robot Editor:
http://robocode.sourceforge.net/help/learning/fileopen.png