import edu.neu.ccs.demeter.dj.*;

class Main {
    static ClassGraph classGraphView = new ClassGraph(
    "class A {public B b;} class B {public D d;} class D {}"
    // "A = B C.  B = D.  C = .  D = ." 
    );
  public static void main(String[] args) {
    // ClassGraph cg = new ClassGraph(); // constructed from *.java
    System.out.println(classGraphView);        
    Strategy sg = new Strategy("from A to D");
    TraversalGraph tg2 = new TraversalGraph(sg, classGraphView);
    A a = new A(new B(new D()), new C());
    tg2.traverse(a, new MyVisitor());

    //TraversalGraph tg = TraversalGraph.compute(cg, sg);
    //tg.traverse(a, new MyVisitor());
    //System.out.println("Traversal Graph for from A to D");
    //System.out.println(tg);        
    System.out.println(a.getD());        
  }
}