[Bluej-discuss] Excercise 4.25 review please

[RDP]

JD,

You've just discovered the "eternal method call" using DOT NOTATION (contrast "internal method call").

See Page 67 in the text book which explains calling methods of other objects.

details += " sold for $" + highestBid.getValue() + "  to: "  +  highestBid.getBidder ().getName();

Your code above is what did it.

Unfortunately, I think the text does not explain nor present more examples of external method calls using dot notation.

Hey good luck!!

Best regards,

Rob DePasquale
Bon Vivant!
  ----- Original Message ----- 
  From: JD 
  To: bluej-discuss at bluej.org 
  Sent: Sunday, June 18, 2006 1:36 PM
  Subject: [Bluej-discuss] Excercise 4.25 review please


  Hi all!

  Please review and comment on my solution for Exercise 4.24.  I have a question at the bottom of this email as well.

  Auction Class:

       /**
       * Close Lot 
       * @return Close lots
       */
      
      public void closeAuction()
      {
          Iterator it = lots.iterator();
          while(it.hasNext()) {
              Lot lot = (Lot) it.next();
              System.out.println(lot.closeLot());
          }
      }


  Lot Class:

      /**
       * @return A string representation of this lot's details.
       */
      public String closeLot() 
      {
          String details = number + ": " + description;
          if(highestBid != null) {
              details += " sold for $" + highestBid.getValue() + "  to: "  +  highestBid.getBidder ().getName();
          }
          else {
              details += "    (No bid)";
          }
          return details;
      }
      

  Output:

  1: Car sold for $3432  to: Carl 

  2: Cat    (No bid)


  Question:

  The following line of code gave me the most grief until I got it working.

  highestBid.getBidder().getName(); 

  It is an object reference to a method to another object to a method within the object referenced by the getBidder() method!?!?!?  It works.  But what the heck did I create here?  What is it called?  Have we covered this type of construction in the book yet and I missed it? 




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