Comparing each item in a List

Hello!!

Trying to remember Singly Linked Lists (did I spell it right? XD).  Basically, here is my compareTo method:

/*
 * compareTo --- compares values of the input to determine order.
 * @return returns a negative number if start > finish
 *                 a positive number if start < finish
 */
    public int compareTo( Object obj )
    {
       Course data = ( Course ) obj;
       if ( finish == data.finish )
       {
          return start - data.start;
       } // end if
       return finish - data.finish;
    } // END compareTo

And I want it to do something like this (of course the following is full of errors):

/*
 * isCompatible --- returns true if this course is compatible to EVERY course already
 *                  on the list, otherwise, false
 */
    public boolean isCompatible( Course courseToCheck )
    {
        if( !(isEmpty()) )
        {
            while( head.getNext() !=null )
            {
                head.getItem().compareTo(courseToCheck);
                head = head.getNext();
            } // end while
            return true;
        } // end if
        return false;
    } // END isCompatible
-------------------------------------------------------

The problem is, courseToCheck is a Course, and head is a Node.  I want this method to look through my entire list, comparing each item in the list and return the appropriate boolean value.

Full code located here:

1. http://www2.hawaii.edu/~fklam/Java/Course.java
2. http://www2.hawaii.edu/~fklam/Java/CourseList.java
3. http://www2.hawaii.edu/~fklam/Java/Node.java

Thank you!!

-luna621 =^^=