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list error

tyte kyat
Ranch Hand

Joined: May 17, 2011
Posts: 40
Hi, I got a question regarding about list and iterator.

the problem is I got a list of type customer return from DataBase.
inside that list there are two elements customer_id and username.

how do I get that customer_id and username element out of the list?
even though I iterate it, it seem does not work.

Thanks in advance.

e.g in my DAO class I got the following


in my business class I got the following


Seetharaman Venkatasamy
Ranch Hand

Joined: Jan 28, 2008
Posts: 5575

1.you have List of Customer

2.you have to get all the customers from the List. how do you do? you need an iterator
then you need to check any more Customer object is in list or not . how do you do this using hasNext() method of that iterator.

3. if any object is there you need to get one by one by using Iterator#next()

4. now you have a Customer object in your hand. you know how to get the properties for the object? using getters?
Steve Luke
Bartender

Joined: Jan 28, 2003
Posts: 4181
    
  21

You will have to look at the Customer class and see what methods it has for getting that data out. Does it have getID() and getUserName() for example? This is something we can't answer without having access to the Customer class.


Steve
Kunal Lakhani
Ranch Hand

Joined: Jun 05, 2010
Posts: 622
What's the error?

With the Iterator you can get the Customer object. Use getters methods to get the data.

I am not sure whether enhanced for loop work in place of Iterator? Give your valuable suggestions


kunal
tyte kyat
Ranch Hand

Joined: May 17, 2011
Posts: 40
yes I do have getter and setter as follow

tyte kyat
Ranch Hand

Joined: May 17, 2011
Posts: 40
Thanks Kunal, Steve and Seetharaman
I got the idea and solved it out now

the reason is I did not create an Object at first and the second is where I do in my DAOImpl class I have to modified it as follow.



instead of using



thanks you all
Kunal Lakhani
Ranch Hand

Joined: Jun 05, 2010
Posts: 622
You can also use criteria api. That's simple and you don't need to embed SQL query.
 
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subject: list error