How to compile a java program w/ another java programs which are w/o a main method

I have been reviewing my "Java Tutorial" lately. For the
CounterDemo.java in IO\example-1dot1, javac CounterDemo.java showed an
error message that can not find the CountWriter/CountReader classes. I
have compiled these two java files at the same driectory.

How do I compile counterDemo.java?

TIA,
Jeffrey


G:\JavaTutExamples\essential\io\example-1dot1>javac CounterDemo.java
CounterDemo.java:5: cannot find symbol
symbol : class CountReader
location: class CounterDemo
CountReader cr = new CountReader(new FileReader("farrago.txt"),
'e');
^
CounterDemo.java:5: cannot find symbol
symbol : class CountReader
location: class CounterDemo
CountReader cr = new CountReader(new FileReader("farrago.txt"),
'e');
^
CounterDemo.java:6: cannot find symbol
symbol : class CountWriter
location: class CounterDemo
CountWriter cw = new CountWriter(new
FileWriter("outagain.txt"), 'e');
^
CounterDemo.java:6: cannot find symbol
symbol : class CountWriter
location: class CounterDemo
CountWriter cw = new CountWriter(new
FileWriter("outagain.txt"), 'e');
^
4 errors

.