Container {
{{
  float statistics(TraversalGraph whereToGo) throws Exception {

    CountingVisitorDJ cV = new CountingVisitorDJ();		//1
    SummingVisitorDJ sV = new SummingVisitorDJ();		//1
    AverageVisitorDJ aV = new AverageVisitorDJ();		//1
    ResultVisitorDJ rV = new ResultVisitorDJ();

    // establish communication between visitors
    aV.set_cV(cV);
    aV.set_sV(sV);     
    rV.set_aV(aV);

// replace the following
//    Visitor[] visitors = new Visitor[4];
//    visitors[0]=(Visitor) rV;
//    visitors[1]=(Visitor) sV;
//    visitors[2]=(Visitor) cV;
//    visitors[3]=(Visitor) aV;
//    System.out.println("visitors prepared");
//    Float res = (Float) whereToGo.traverse(this, visitors);

    Float res = (Float)  whereToGo.traverse(this,
    	     new Visitor[] { rV, sV, cV, aV });

    return res.floatValue();
  }  
}}
}