How to add number of String values to an ArrayList?

Question

I have a scenario wherein I have a Bean class from where I'm getting all the Client names and other Client related details. I'm creating a Bean object and getting all the details.

ArrayList<ClientBean> clientList = (ArrayList<ClientBean>) (new QueriesDAO())
                .getAllClient();

From the above code I am getting all the details of the Client. And to get only the Client names I'm through the index form,

ClientBean clist = clientList.get(2);   
        for (ClientBean clientBean : clientList) {
        clientBean.getclientName(); // here I'm getting only the Client names one by one.   
        }

My Question is How do I add only the Client names in an ArrayList dynamically?

Davide Lorenzo MARINO · Accepted Answer · 2016-01-16 11:28:02Z

3

Generally to add values to a List (so also to an ArrayList) you can use the methods:

add(E e) to add an element at the end of the list
add(int index, E element) to add an element in the specified position
addAll(Collection<? extends E> c) to add all the element at the end of the list
addAll(int index, Collection<? extends E> c) to add all the element starting from a specified position

Please check the documentation (linked on the answer) for details on each method.

To add all client names to a list (I assumed that a name is a String, eventually change the type)

List<String> names = new ArrayList<String>();
for (ClientBean clientBean : clientList) {
    names.add(clientBean.getclientName());
}
// Here names is a list with all the requested names

edited Jan 16, 2016 at 11:28

answered Jan 16, 2016 at 11:17

Davide Lorenzo MARINO

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4 Comments

Sam Over a year ago

I tried with list.add() but its only adding the last value.

Davide Lorenzo MARINO Over a year ago

You need to iterate (for example with a for loop) if you need to add many values or you need to use addAll. add(E e) adds an element (only one)

Sam Over a year ago

when I use addAll() I get the reference value. Not the Client Names.

Davide Lorenzo MARINO Over a year ago

addAll add all the elements of a collection. If you need to add the client names I show you how to do

Justin Kaufman · Accepted Answer · 2016-01-16 11:21:08Z

2

Consider using Java 8's Lambda features. Based on your post it sounds like this is what you're looking for.

List<ClientBean> allClients = new QueriesDAO().getAllClients();
List<String> allClientsNames = allClients.stream()
                                         .map(ClientBean::getClientName)
                                         .collect(Collectors.toList());

answered Jan 16, 2016 at 11:21

Justin Kaufman

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1 Comment

Justin Kaufman Over a year ago

Public support for 1.5 ended on Oct 2009, premier support ended on May 2011, and extended support ended on May 2015. Seriously consider upgrading.

vnc · Accepted Answer · 2016-01-16 11:27:46Z

1

Like you get the Clientnames one by one, you can fill up your list one by one

answered Jan 16, 2016 at 11:27

vnc

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