[Bluej-discuss] Excercise 4.24

[Michael Kölling]

As I mentioned before (below), there is a getHighestBid() method in  
the Lot class.

You cannot just write 'highestBid' -- it is not clear where the value  
would come from. Instead, you need to call the method. To call the  
method, you have to look out for two things: it needs the receiving  
object (lot) at the beginning (with dot notation) and it needs the  
parentheses at the end.

Also, you have to take care to use the double-equal (==) for  
comparison, not =.

Michael

On 4 Apr 2006, at 11:22, Marko Bajic wrote:

>
>
> Thankyou, but i am still having troubles. I write:
>
> public Lot close()
>    {
>        Iterator it = lots.iterator();
>        while(it.hasNext()) {
>            Lot lot = (Lot) it.next();
>            if(highestBid = null){
>          System.out.println(lot.toString() + "unsold");
>        }else{System.out.println(lot.toString()+ "sold");
>
>        }
>    }
>
> I just get a message that it is uunable to find highestBid. I know  
> I have to make it visible from here but I do not know how.
>
> Thankyou,
> Marko
>
>
>> From: Michael Kölling <M.Kolling at kent.ac.uk>
>> Reply-To: General discussion for users of BlueJ <bluej- 
>> discuss at bluej.org>
>> To: General discussion for users of BlueJ <bluej-discuss at bluej.org>
>> Subject: Re: [Bluej-discuss] Excercise 4.24
>> Date: Sun, 2 Apr 2006 15:08:14 +0100
>>
>> On 2 Apr 2006, at 9:23, Marko Bajic wrote:
>>
>> > I was wondering if I could have some help on a particular question.
>> >     Exercise 4.24 of Objects with Java Blue-J is giving me
>> > problems. Here is
>> > my
>> >     code so far. I might be miles off for all I know.
>> >     public Lot close()
>> >         {
>> >             Iterator it = lots.iterator();
>> >             while(it.hasNext()) {
>> >                 Lot lot = (Lot) it.next();
>> >                 if ( [I'M NOT SURE WHAT GOES HERE] >1){
>> >                 System.out.println(lot.toString()+ "sold");
>> >             }else{
>> >                 System.out.println(lot.toString() + "unsold");
>> >             }
>> >         }
>> >         }
>>
>> That's a good start.
>>
>> The missing if-statement should say something like
>>
>> if (THERE-WAS-AT-LEAST-ONE-BID) {
>>      ...
>> }
>>
>> To test whether there was a bid, you can use the Lot's getHighestBid
>> () method. (Have a look at the comment for that method: it says that
>> it will return a Bid, or null if there was no bid.)
>>
>> So you might write something like
>>
>> if(ATTEMPT TO GET LOT'S HIGHEST BID IS NOT NULL) {
>>     ...
>> }
>>
>> Regards,
>>
>> Michael
>>
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