[Saber Cherry]

Good point. In addition to

dir Fight.class

try typing

java -Version

My development environment:

C:\WINDOWS>java -Version
java Version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)