CountingVisitorDJ {
// how to use:
// to count all X-objects
// change "Weight" to "X"
// Java does not support this parameterization
{{
  public void start() { total=0; System.out.println("begin"); }
  public void before(Weight o) { 
    System.out.println("count"); 
    total++;
    System.out.println("before Weight"); }
  public Object getReturnValue() {return new Integer(total);}
}}
}