public class List
{
   public List()
   {
      head = null;   // Start with an empty list of BankAccount objects
   }

   // *******************************************************************
   // insert(amount): make an object and insert into list at this.head
   // *******************************************************************
   public void insert(double amount)
   {
      BankAccount elem;

      elem = new BankAccount(amount); // Make BankAccount object   

      if ( this.head == null || amount <= this.head.getBalance() )
      {  // Insert in empty list or at the start of list
         elem.setNext(head);
         head = elem;
      }
      else
      {  // Insert after the start of the (non-empty) list
         BankAccount p1, p2;

         // Find enclosing elements p1 & p2
         p1 = head;
         p2 = head.getNext();
         while ( p2 != null && amount > p2.getBalance() )
         {
            p1 = p2;
            p2 = p2.getNext();
         }

         // Link new element between p1 & p2
         p1.setNext(elem);        
         elem.setNext(p2);
      }
   }


   // Method returns a String with balances in the whole list
   public String toString()
   {
      String out = "";
      BankAccount p;

      p = head;
      while (p != null)
      {
	 out = out + "[" + p.getBalance() + "] ";
	 p = p.getNext();    // move down the chain !!!
      }

      return(out);
   }

}