Get values from methods in objects that are in arraylist?

Question

ArrayList<Customer> customerList = new ArrayList<Customer>();
// add object to arraylist
customerList.add(customer);

// get objects from arraylist
customerlist.get(0);

But how do I get the value from a method that is inside the class like if I have a method like getCustomerName() inside and I want the name in return or perhaps I want to change or add something to a method. How do I write the call? Preciate some help! Thanks!

Dave Newton · Accepted Answer · 2011-11-22 13:14:43Z

3

// Single reference.
customerlist.get(0).getCustomerName();

// Or...
Customer c = customerlist.get(0);
c.getCustomerName();

// Or looping.
for (Customer c : customerList) {
    c.getCustomerName();
}

Once you have a reference to the Customer object you can do whatever things you normally do to customers.

answered Nov 22, 2011 at 13:14

Dave Newton

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9 Comments

3D-kreativ Over a year ago

Aha! That easy! So if I want to set some information I can just call the method like customerlist.get(0).setCustomerName("Sandra"); ??

Dave Newton Over a year ago

@3D-kreativ Yep :) Although for something like that, it seems like it would be better to do all that work on the customer before adding it to the list, just to avoid confusion.

3D-kreativ Over a year ago

Hmmm, well I'm doing a task that is like a simple bank system where you create objects like Customers and SavingsAccount. And my idea was to store all Customer objects in one arraylist and all SavingsAccount objects in one arraylist. It must be possible to change the balance and name in the objects, thats why I wondered how to add new values to the objects in the arraylist. I'm new to this, so it's a little bit confusing, but I'm learning.

mre Over a year ago

@3D-kreativ, Perhaps write a singleton manager class that's responsible for adding/retrieving accounts?

Dave Newton Over a year ago

@3D-kreativ Hmm. To me it seems like a Customer should have a collection of accounts, or a single account. Things get interesting once you realize that an account could be associated with multiple customers.

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ttt · Accepted Answer · 2011-11-22 13:55:55Z

0

you can implement that using Map

as you have to locate some certain object using the id

map.get(id).setBalance(map.get(id).getBalance() + 100000);

answered Nov 22, 2011 at 13:55

ttt

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