How to create a new ArrayList containing all elements from an int[] arrary?

Question

This is my code so far. I'm kind of new with ArrayLists.

public void fill(int []arr){
   ArrayList<Integer> intList = new ArrayList<Integer>();
}

Thats all I have so far. I don't know how to put all of the elements from int[] arr into the new ArrayList. The elements should be in order as well.

With `intList.addAll(Arrays.asList(arr));` though this sounds suspiciously like homework. — user268396, Mar 12 '12 at 00:11
possible duplicate http://stackoverflow.com/questions/157944/how-to-create-arraylist-arraylistt-from-array-t-in-java — Titouan de Bailleul, Mar 12 '12 at 00:11
You should take a look at [this post](http://stackoverflow.com/questions/157944/how-to-create-arraylist-arraylistt-from-array-t-in-java). I think this is exactly what you need. Hope it helps — Titouan de Bailleul, Mar 12 '12 at 00:10
@user1261935 - If this is homework, it should tagged as such. — Leigh, Mar 12 '12 at 08:13
If you made any progress or solved the problem you could accept an answer as well :) — alex, Mar 13 '12 at 13:36

score 3 · Answer 1 · answered Mar 12 '12 at 00:10

3

If you had an array of objects, you could use Arrays.asList ..., but with primitives, you'll have to loop through the array and add each element to the arraylist individually.

for (int i : arr) {
    intList.add(i);
}

answered Mar 12 '12 at 00:10

JRL

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score 3 · Answer 2 · answered Mar 12 '12 at 00:12

3

List<Integer> list = Arrays.asList(myIntArray);

Otherwise, you will need to use a loop and iterate over the array.

answered Mar 12 '12 at 00:12

Tyler Treat

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score 0 · Answer 3 · answered Mar 12 '12 at 00:14

0

This should do the job.

public void fill(int []arr){
   ArrayList<Integer> intList = new ArrayList<Integer>();
   for(int i = 0; i < arr.length; i++) {
      intList.add(arr[i])
   }
}

Also refer to the ArrayList JavaDoc.

answered Mar 12 '12 at 00:14

alex

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How to create a new ArrayList containing all elements from an int[] arrary?

3 Answers3