// package base; 
import java.util.*;
abstract class Item {
  String name;
  public abstract int check();
}
class Container extends Item {
  Vector contents;
  int capacity;
  public static Container make(
		     String n,int c) {
    Container res = new Container();
    res.name = n;
    res.capacity=c;
    res.contents = new Vector();
    return res;
  }
  public void addItem(Item i) {  /*\label{line:cont-addItem}*/
    contents.add(i);
  }
  public int check() {  /*\label{line:cont-check}*/
    System.out.println(" checking a new container recursively: only called if weight changed ");
    Iterator it=contents.iterator();
    int total = 0;
    while(it.hasNext()) {
      Item child =  (Item)it.next();
      total+=child.check();
    }
    System.out.println(
       "Container "+name+
       " weighs "+total); 
    if(total>capacity){
       System.out.println(
           "Container "+name+
           " overloaded");
    }
    return total;
  }
}