How to convert an ArrayList to a final String array?

Question

I need to convert an ArrayList to a String array which is declared as final,

I ended up with this:

        //new array
        String[] arrTextRow=new String[customListTxt.size()];
        customListTxt.toArray(arrTextRow);
        //new final array 
        final String[] arrTextRow2=arrTextRow;

it's working, but just wondering if there is a more elegant way to achieve this, such as:

        final String[] arrTextRow =new String[]{
            for(String zz : customListTxt){
                //dosomethinghere
            }
        };

Why not just declare arrTextRow final?

khelwood
– khelwood

2019-05-22 08:27:34 +00:00
Commented May 22, 2019 at 8:27 — khelwood
– khelwood, Commented May 22, 2019 at 8:27

pdem · Accepted Answer · 2019-05-22 08:35:22Z

1

I prefer the one liner:

final String[] arrTextRow2=customListTxt.toArray(new String[0]);

The new String[0] is not that expensive, but you can always make it a constant.

answered May 22, 2019 at 8:35

pdem

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1 Comment

carloca Over a year ago

Thanks! also previous solutions are fine, but this is the one I prefer

sulox32 · Accepted Answer · 2019-05-22 08:34:38Z

0

You can declare the first Array arrTextRow final too.

//Convert to string array
final String[] arrTextRow = customListTxt.toArray(new String[customListTxt.size()]);

answered May 22, 2019 at 8:34

sulox32

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Comments

karan · Accepted Answer · 2019-05-22 08:34:45Z

0

You can use list.toArray()

final String[] array = customListTxt.toArray(new String[customListTxt.size()]);

answered May 22, 2019 at 8:34

karan

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Comments

Median Hilal · Accepted Answer · 2019-05-22 08:35:16Z

0

I think there is no way more elegant than toArray(). Also, you can define arrTextRow as final.

final String[] arrTextRow = new String[customListTxt.size()];

The point is, final doesn't make array element immutable, but the array reference itself, i.e., after defining the array as final, you cannot change the arrTextRow, but still can change the individual elements of it.

See here for example

answered May 22, 2019 at 8:35

Median Hilal

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