How to add File [] Array content into ArrayList?

Question

I have an array:

File [] temp=null;

And I have an arrayList of File type:

List <File> tempList = new ArrayList <File>();

Now I want to add the content from temp to tempList. So anyone can please tell me How do I this?

loop through the `temp` array and add each File to the `tempList` — MaVRoSCy, May 08 '13 at 10:05
Just so others know, adding array contents to an `ArrayList` using a for loop will give you a warning in Android Studio that says it prefers you use the `ArrayList`'s `addAll()` method. You could still do it, but for some reason Android Studio doesn't prefer it (maybe it's more efficient to use the method?) — Azurespot, Apr 27 '15 at 01:07

score 14 · Accepted Answer · edited May 08 '13 at 10:12

14

Try this

tempList.addAll(Arrays.asList(temp));

edited May 08 '13 at 10:12

Rahul

answered May 08 '13 at 10:10

Sanjaya Liyanage

'http://stackoverflow.com/questions/16433915/how-to-copy-file-from-one-location-to-another-location' can you plz see this problem. – vijayk May 08 '13 at 10:26

Adrian Shum · Answer 2 · 2015-02-28T13:15:21.200

4

If you are not going to update the content of the array (add/removing element), it can be as simple as

List<File> tempList = Arrays.asList(temp);

Of course, if you want a list that you can further manipulate, you can still do something like

List<File> tempList = new ArrayList<File>(Arrays.asList(temp));

edited Feb 28 '15 at 13:15

answered May 08 '13 at 10:06

Adrian Shum

The second line of code should be `List tempList = new ArrayList<>(Arrays.asList(temp));`, note the diamond in `ArrayList<>` – bcsb1001 Feb 28 '15 at 13:13
Dunno why I missed that lol. Lemme fix that – Adrian Shum Feb 28 '15 at 13:14

score 2 · Answer 3 · answered May 08 '13 at 10:05

2

use following

List<File>tempList = Arrays.asList(temp);

answered May 08 '13 at 10:05

ajduke

score 2 · Answer 4 · answered May 08 '13 at 10:05

2

You can iterate through the array and add each element to the list.

for (File each : temp)
  tempList.add(each);

answered May 08 '13 at 10:05

The Cat

score 2 · Answer 5 · answered May 08 '13 at 10:05

2

You can use a collections library call for this:

Arrays.asList(temp);

answered May 08 '13 at 10:05

eldris

5 Answers5