What should I grade ?

  public void mst(){
    ArrayList<T> visited = new ArrayList<T>();
    ArrayList<T> unvisited = (ArrayList<T>)this.vertices.clone();
    visited.add(unvisited.remove(0));

    while(unvisited.size() > 0){
      T nextVertex = null;
      T startVertex = null;
      int minimumWeight = Integer.MAX_VALUE;
      int visitedSize = visited.size();
      int unvisitedSize = unvisited.size();

      for( int i = 0; i < visitedSize; i++ ){
        T fromVertex = visited.get(i);
        for( int j = 0; j < unvisitedSize; j++ ){
          T currentVertex = unvisited.get(j);
          int currentWeight = this.getWeight(fromVertex, currentVertex);
          if( minimumWeight > currentWeight ){
            minimumWeight = currentWeight;
            nextVertex = currentVertex;
            startVertex = fromVertex;
          }
        }
      }

      System.out.printf("(%s) - (%s)\n", startVertex, nextVertex);
      unvisited.remove(nextVertex);
      visited.add(nextVertex);
    }
  }