# Merge 2 Arraylist\<Int\> in One ArrayList\<int\>

**URL:** <https://discuss.kotlinlang.org/t/merge-2-arraylist-int-in-one-arraylist-int/3323>\
**Category:** Android\
**Created:** [June 14, 2017, 9:46pm UTC](https://discuss.kotlinlang.org/t/merge-2-arraylist-int-in-one-arraylist-int/3323 "2017-06-14T21:46:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![MrZak-Dev](https://avatars.discourse-cdn.com/v4/letter/m/5fc32e/32.png) [@MrZak-Dev](https://discuss.kotlinlang.org/u/MrZak-Dev)\
**Post date:** [June 14, 2017, 9:46pm UTC](https://discuss.kotlinlang.org/t/merge-2-arraylist-int-in-one-arraylist-int/3323/1 "2017-06-14T21:46:35Z")

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I have two `ArrayList<Int>`

And i want a way to merge both of the `ArrayList<Int>` in 1 new `ArrayList<Int>`

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**Author:** ![alanfo](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@alanfo](https://discuss.kotlinlang.org/u/alanfo)\
**Post date:** [June 14, 2017, 10:43pm UTC](https://discuss.kotlinlang.org/t/merge-2-arraylist-int-in-one-arraylist-int/3323/2 "2017-06-14T22:43:59Z")

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It’s as simple as:

```auto
 val arrayList3 = arrayList1 + arrayList2

```

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**Author:** ![MrZak-Dev](https://avatars.discourse-cdn.com/v4/letter/m/5fc32e/32.png) [@MrZak-Dev](https://discuss.kotlinlang.org/u/MrZak-Dev)\
**Post date:** [June 14, 2017, 11:22pm UTC](https://discuss.kotlinlang.org/t/merge-2-arraylist-int-in-one-arraylist-int/3323/3 "2017-06-14T23:22:05Z")

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i solved it with  
arraylist3.addAll(arraylist1)  
arraylist3.addAll(arraylist2)  
Thank you by the way 🙂

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**Author:** ![artan.berisha](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@artan.berisha](https://discuss.kotlinlang.org/u/artan.berisha)\
**Post date:** [May 6, 2020, 12:27pm UTC](https://discuss.kotlinlang.org/t/merge-2-arraylist-int-in-one-arraylist-int/3323/4 "2020-05-06T12:27:13Z")

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This returns a List , not an ArrayList. I was using this method but I got an List as the type of arrayList3 in your case.