Divide Arraylist into several parts

[Siana Ivanova]

Hi,
I have an ArrayList of similar Strings.

Now I have to partition the lists into multiple lists with several parts.

Here is the sample data set

 public ArrayList<String> nextSubList() {
      
            fromIndex += size;
            toIndex = fromIndex + size;
            result = new ArrayList<String>(lists.subList(fromIndex, toIndex))
            return result;
    }

How can i make the size of sublists several?

[Winston Gutkowski]

Siana Ivanova wrote:How can i make the size of sublists several?

Well, assuming you want to return them all at the same time, how about a List?

There's nothing to stop you storing a List as each element of a List, and yours would then be declared as
  List<List<String>> ...

HIH

Winston

[Siana Ivanova]

I want the size of sublists is dynamic.

[Winston Gutkowski]

Siana Ivanova wrote:I want the size of sublists is dynamic.

Lists are dynamic. That's one of the reasons to use them instead of arrays.

Winston

[Siana Ivanova]

To know.
My question is not set correctly
I got the following list:

List<String> list = new ArrayList<String>();
        list.add("one");
        list.add("two");
        list.add("tree");
        list.add("four");
        list.add("seven");
        list.add("ten");

I want my method call Next I first printed two elements, the next call to method print three elements, the next call method again print two elements.

[Liutauras Vilda]

Siana Ivanova wrote:I want my method call Next I first printed two elements, the next call to method print three elements, the next call method again print two elements.

You don't have enough elements in it to do so, you need 2, 3, 2 = 7 elements. I see you have only 6.

Anyway, problem probably not there. Do you have clear and written somewhere requirements so we could have a look at?
I just read your original question, which I did not understand, and the latest - these do not match. Please try clearly define your problem.

[Siana Ivanova]

Ok. Sorry!
I have a class, that receives a list of items and divide it into list. Is defined size - a list of how many items are displayed at once.
The class has method next(), that returns next few elements of the list. Is defined size - a list of how many items are displayed at once.

public class Util {
    private List<String> lists;
    private ArrayList<String> result;
    private int size;
    private int fromIndex;
    private int toIndex;


    public Util(List<String> listOfPages, int pageSize) {
        this.lists = listOfPages;
        this.size = pageSize;
    }

    public ArrayList<String> next() {
        fromIndex += size;
        toIndex = fromIndex + size;
        result = new ArrayList<String>(lists.subList(fromIndex, toIndex));
        return result;
    }

I want this size to be dynamic.

[Winston Gutkowski]

Siana Ivanova wrote:I have a class, that receives a list of items and divide it into list.

So, as I said before, you have a List of Lists - or rather, a List of sublists (which are themselves Lists, as you've already worked out).

And as I also said, you don't have to worry about size, because Java Lists are dynamic.

The only thing you need to do is change your 'lists' definition to
  private List<List<String>> lists;
and add a new sublist for each element.

Winston

[Siana Ivanova]

Thank you very much!