Welcome to the Ranch.
No, don't set a CLASSPATH environment variable; if it is already set, remove it. If there is no CLASSPATH set, the Java compiler and runtime will look in the current directory for *.class files. So, suppose you have your source files in the directory C:\Project, then
you should be able to compile them like this:
C:\Project> javac Cycle.java
C:\Project> javac Unicycle.java
You can also specify the classpath on the command line with the
-cp or
-classpath option. If, for some reason, the above doesn't work, try specifying the current directory ".":
C:\Project> javac Cycle.java
C:\Project> javac -cp . Unicycle.java
If you get any error messages, then please copy & paste the exact error message here - the more precise information we get, the better we can help you solve this.