How to change every string element of an arraylist?

Question

I have a ListView with an arraylist with an unknown number of string elements. I want to change/modify every single one of these string items. The problem is that i dont know how many items there are since the user can change it.

I have a translate function that takes a string and returns a string. What i want to do is

arraylistelement1 = translate(arraylistelement1);
arraylistelement2 = translate(arraylistelement2);
...

and repopulate the listview arraylist with the new strings.

Whats a way to do this?

Something like (for int i=0; i< mArrayList.size(); i++){...} — nhaarman
– nhaarman, Commented Oct 15, 2013 at 7:34

tom · Accepted Answer · 2013-10-14 22:13:14Z

2

Iterate over the list and create a new list of translated options from the original then replace the contents of the original list with the new values. If you do the replacing while iterating you'll get ConcurrentModificationExceptions.

answered Oct 14, 2013 at 22:13

tom

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3 Comments

sddamico Over a year ago

ArrayList<String> temp = new ArrayList<String>(); for(String string : strings){ temp.add(translate(string)); } strings = temp;

Simon Over a year ago

@MuratKaya He just did!

Murat Kaya Over a year ago

yes didnt see it before. I couldnt get the code to work though. I put my arraylist instead of strings. Do I replace string with anything?

pscuderi · Accepted Answer · 2013-10-15 11:20:18Z

2

Use ListIterator.set:

public static void main(String[] args) {
    List<String> list = new ArrayList<>(Arrays.asList("s0", "s1", "s2"));

    ListIterator<String> iter = list.listIterator();

    while (iter.hasNext())
       iter.set(translate(iter.next()));

    for (String element : list)
        System.out.println(element);
}

public static String translate(String element) {
    return element + " " + Math.random();
}

edited Oct 15, 2013 at 11:20

answered Oct 15, 2013 at 0:16

pscuderi

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