::::::::::::::
A.java
::::::::::::::

public class A {
  A(B b, C c) {
    this.b = b;
    this.c = c;
  }

  public B b;
  public C c;
}

::::::::::::::
B.java
::::::::::::::

public class B {
  B(D d) { this.d = d; }

  public D d;
}

::::::::::::::
C.java
::::::::::::::

public class C {}

::::::::::::::
D.java
::::::::::::::

public class D {}

::::::::::::::
Main.java
::::::::::::::

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

class Main {
  public static void main(String[] args) {
    ClassGraph cg = new ClassGraph(); // constructed from *.java
    A a = new A(new B(new D()), new C());

    cg.traverse(a, new StrategyGraph("A->D"), new MyVisitor());
  }
}

::::::::::::::
MyVisitor.java
::::::::::::::

import EDU.neu.ccs.demeter.dj.Visitor;

public class MyVisitor extends Visitor {
  public void start() { System.out.println("begin"); }
  public void finish() { System.out.println("end"); }

  public void before(A o) { System.out.println("before A"); }
  public void after(A o)  { System.out.println("after A"); }

  public void before(B o) { System.out.println("before B"); }
  public void after(B o)  { System.out.println("after B"); }

  public void before(C o) { System.out.println("before C"); }
  public void after(C o)  { System.out.println("after C"); }

  public void before(D o) { System.out.println("before D"); }
  public void after(D o)  { System.out.println("after D"); }
}

::::::::::::::
output
::::::::::::::

begin
before A
before B
before D
after D
after B
after A
end